HS1 834228961 62 HQ 83894 Serial 164

. 62- IHC-83894 I Serials EBF 154 ~ ~ 11111 I11111 IH~ llm t EBF 62-HCl-83894-ESF" 164 DO NOT· DES.fRO)' •• _ ~ U l FBI - CENTRAL RECORDS CENTER t7 {iJ;; +• _ _ . HQ - HEADQUARTERS . Class / Case # Sub 0062 83694 Vol. 1 Serial # 164 8/11/1274166 IIHIIMIIIIIIIIIIIIl llllllll~I I I 11111/II RRPO031XG8 ONLY I ' ' RESTRICTED r DEPARTMENT OF THE AIR FORCE HEADQUARTERS UN1TED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to s ightings of unconventional ai rcraft and unidentified flying objects, including the so- called "Flying Discs." b. 2. To establish procedures for reporting such information. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and l etter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately afte:' sighttngs. (2) Supplementary reports should be forwarded as availabl e by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Dir ector of Intelli­ gence, Headquarters United States Air Force. Cables will contain the phase, " Pass to COMGENAMC WRIGHT- PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO- 3." RESTRICTED C9-~892, AF .. RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc­ tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the d~velop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otqer than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com­ mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer' s position): a. Ground (1) City, town. (2) Distance and direction from cit y or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer' s aircraft. (4) Latitude and longitude.' c . Sea (1) Latitude and longitude. (2) Proximity to land. 4. (Name city, country, etc.) Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. c. Apparent construction. d. Size. (Sketch if possible) (Of what material or substance) (1) Estimated size. (2) Size as it appeared from observer's view. 9. (Compared to known object) Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc . 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 - • 12. 13. 14. c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? RESTRICTED (spurts) Effect on clouds. a. Opened path thru clouds . b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in r elation to speed. Support a. Wings. b. Aerodynamic list of fuselage. c . Vertical jet. 15. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED , .. ,,. .. .. RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. 20. Intermittent. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. 5. 6. Employer or employee. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). AbUity to determine: a. Color . b. Speed of moving objects. c . Size at distance. 7 . Reliability of observer. a. Sources. RESTRICTED - 5 - . '' RESTRICTED 8. (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. 10. a. Addressees. b. Occupation. C. Reliability. Comments of interrogator regarding the intell1gence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED • ,. ' RESTRICTED • 3. Local flight schedules of commercial, private and military aircraft flying in vic!nity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. Jf object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. Jf object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (ii this happened). d. Maneuvers. e. Formation ii objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentlons that might presum­ ably be construed as such). c>:1-?~ C. P . CABELL Major General, USAF Director of Intelligence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 - • RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establlsh procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, ar e herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports wlll be transmitted to the Director of Intelll­ gence, Headquarters United State:s Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED ~a- 8 ~t-9~-/t'1/ RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and or ganizations under their control in connection with the development of information on thl.s subject. c . Major Air Commands (ZI) (1) Reports wlll be forwarded direct to the Commanding General , Al.r Materiel Command, Wright-Patterson Al.r Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations r eceiv­ ing lnformation pertaining to the requirements enunciated in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all r eports sent to Air Materiel Command in accordance with these instruc­ tions wlll be forwarded at the same ti.me to the Director of Intelligence, Headquarters United States Air Force. (4) Written r eports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizations under thel.r control in connection wl.th the develop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otQer than those of the United States Air Force are r equested to forward r eports direct to the Commanding General, Al.r Materiel Command, Wright-Patte r son Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to r educe the ti.me factor involved in transmission of this type of information it is r equested that, wher eve r communications facilities permit, subordinate elements be authorized to communicate reports dir ect to the Commanding General, Air Materiel Com­ mand. PART Il - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Wher e sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or t own, road, intersection, etc. (3) Fr om building (story), yard, etc. (4) Map coordinates (lf feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRIC:t'ED b. Air (1) Type aircraft, speed, altltude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea 4. (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc .) Number of objects. Formation type (l.f any), sketch l.f possible. 5. Observable celestial phenomena or planets that may account for the slghtlng. (Local fac111t!.es or organizations which follow such celestial phenomena should be consulted for such information.) 6. 7. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. Time in sight. 8. Appearance of object. a . Color. (Sketch ti possible) b. Shape. c. Apparent construction. d. Size. (1) (Of what material or substance) Estimated size. (2) Size as Lt appeared from observer's view. Q. (Compared to known object) Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osctllatlng, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 - RESTRICTED 12. c. Odor (if any). d. Rate of evaporatlon. e. Does trail vary with sound? (spurt s) Effect on clouds. a. Opened path thru clouds. b. F orced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. Lights. 14. a. Reflected or attached. b. Luminous c. Blinked on and off in r elation t o speed. Support a. Wings. b. Aerodynamic list of fuselage. c . Vertical jet. d. Rotating cylinder or cone. e . Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet . b. Rotor . c . Aerodynamlc vanes (flapping or osclllating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control artd stability. a. Fins b. Stablll.zers (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRIC T ED RESTRICTED 17. Al.r ducts. a. Slots. b. 18. Duct openings. Speed - M.P.H. 19. Sound. 20. a. Continuous wblne or buzz. b. Roar, whistle, whoosh. c. Interml.ttent. Manner of disappearance. a. Explode. (1) Possl.bill.ty of fragments. (2) Other physl.cal evldence. b. Faded from vlew. c. Disappear ed behlnd obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4 . Place of business. a. 5. Employer or employee. Pertinent hobbles. a. Is observer amateur astronomer, pllot, engineer, etc. b . Length of time engaged in hobby (experience). 6. Abllity to determine: a. Color. b. Speed of movl.ng objects . c. Size at distance. ? . ReUabll1ty of observer. a. Sources. REST RICTED - 5 - RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records . (4) 8. Employer. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of llght. c. Degree of fatigue and duratlon of flight at time of sighting in cases where observer ls airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliabllity. 10. Comments of interrogator regarding the intelligence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on gr ound. a . Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn 1s not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Wer e there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc . GENERAL 1. Teletype sequences of local weather condltl.ons. 2. Winds aloft r eport. - 6 - RESTRICTED RESTRICTED 3. Local fUght schedules of commercial, private and m1litary aircraft flying in vicinity at the time. (Check Canadian activ1ty 1f close to that border.) 4. Possible releases of testing devices ln vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 6. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of sons. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b . Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, 1.e., (any projections or extentions that might presum­ ably be construed as such). c>: t - ! ~ C. P. CABELL Major General, USAF Director of Intelligence, Offlce of Deputy Chtef of Staff, Operations DISTRlBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelllgence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director I Federal Bur eau of Investigation RESTRICTED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENI' OF THE Affi. FORCE HEADQUARTERS UNITED STATES Am FORCE DmECTORATE OF INI'ELLIGENCE WASHINGTON 25, D. C . 15 February 1949 Am INTELLIGENCE REQUIBEMENI'S MEMORANDUM NUMBER 4 UNCONVENTIONAL Arn.CRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum ls twofold; a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and un1dent1f1ed flying objects, including the so-called "Flying Discs. " b. 2. To establish procedures for reporting such information. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditlous means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intem­ gence, Headquarters United State:s Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, wlll be forwarded to the Director of Intelllgence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Al.r Commands (over seas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (Zl) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by l.nstallations r eceiv­ ing information pertaining to the requirements enunciated in Part TI. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all r eports sent t o Air Materiel Command in accordance with these instruc­ tions will be forwarded at the same time to the Dlrector of Intelligence, Headquarters United States Air Force. (4) Written r eports wlll be submitted on AF Form 112. (5) Commanding General, Al.r Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otQer than those of the United states Air Force ar e r equested to forward reports direct to the Commanding General, Air Materiel Command, Wright- Patter son Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to r educe the time factor involved in transmission of this type of information it ts r equested that, wher ever communications facillties permit, subordinate elements be authorized to communicate r eports direct to the Commanding General, Air Mat eriel Com­ mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, r oad, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and l~ngitude. - 2 - RESTRICTED RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. 4. (Name city, country, etc.) Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. d. Size. (Of what material or substance) (1) Estimated size. (2) Size as it appeared from observer's view. 9. (Compared to known object) Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osclllating, fluttering, evasive, aggr essive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. • RESTRICTED - 3 - RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? 12. (spurts) Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists . c. Reflected on cloud. d. Showed thru cloud. 13 , Lights. a. Reflected or attached. b. Luminous c. Blinked on and off Ln r elation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage . c. Vertical jet. d. Rotating cylinder or cone. e. Aer ostatic lift (balloon or dirigible) . 15. Propulsion. a. P r opeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. StabiUzers (hor izontal or vertical). (1) Size. - 4 - (2) Shape . (3) Location. RESTRICTED RESTRICTED 17. Alr ducts. a. Slots. b. Duct openlngs. 18. Speed - M.P.H. 19. Sound. a. Continuous whlne or buzz. b. Roar, whlstle, wl;loosh. c. Intermittent. 20. Manner of disappearance. a. b. Explode. (1) PosslbHlty of fragments. (2) Other physical evidence. Faded from view. c . Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. 5. Employer or employee. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged ln hobby (experience). 6. Ablllty to determine: a . Color. b. Speed of moving objects. c. Size at distance. 7. Rell.abllity of observer. a. Sources. RESTRICTED - 5 - RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to ob1ect(s). (1) Sound. (2) Motion. (3) Glint of light, c. Degree of fatigue and duration of :flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelHgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observatlons of range, speed, altitude and size of target. b. Did target executive any turns? If so, what arlgle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay 1n the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED .. RESTR I CTED 3, Local flight schedules of commercial, private and m111tary aircraft flying in vicinity at the time. {Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Alr Force, Army, Weather Units, Research Organizations or any other. 6. If object contacted earth, obtain sou samples within and without depression or spot where object landed {and then presumably departed) for purpose of making comparison of sol.ls. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs {or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, l..e., {any projections or extentlons that mlght presum­ ably be construed as such). cl?~ C. P. CABELL Major General, USAF Director of Intelligence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Dir ector of Central Intelligence Special Assistant for Research and IntelUgence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investlgatlon RESTRIC TED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE Affi FORCE HEADQUARTERS UNITED STATES AIR FORCE DlRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 16 Febr uary 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AJRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transfer red to Air Force agencies for action, a r e herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary r eports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports wlll be transmitted to the Dir ector of Intelli­ gence, Headquarters United State:s Air Force. Cables will contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0- 3." RESTRICTED C9-H92, AF RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelll.gence, Headquarter s Unlted States Alr Force. (3) Commandlng General, Air Materiel Command is authorized direct contact with major Alr Commands (overseas) and or ganizations under thelr control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded dlrect to the Commanding General , Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installatlons r eceiv­ ing information pertaining to the requirements enunciated ln P art II. (2) Coples of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc­ tions will be forwarded at the same time to the Director of Intelllgence, Headqua rters United States Air Force. (4) Written r eports will be submitted on AF Form 112. (5) Commandlng Gener al, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the develop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otQer than those of the United States Air Force are r equested to forward r eports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved ln transmission of this type of information it is r equested that, wher ever communications facilltles permit, subordinate elements be authorized to communicate r eports direct to the Commanding General, Air Materiel Com­ mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's posltion): a. Ground (1) City, town. (2) Distance and direction from city or town, road, lnter sect1on, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer' s aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proxlmity to land. 4, (Name city, country, etc.) Number of objects. Formation type (if any), sketch 1f possible . 6. Observable celestial phenomena or planets that may account for the s lghtlng. (Local facillties or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c . Apparent construction. d. (Of what material or substance) Size. (l} Estimated size. (2) Size as Lt appeared from observer's view. (Compared to known object) 9. Direction of flight, 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osclllatlng, flutterlng, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 - RESTRICTED 12, C. Odor (if any). d. Rate of evaporation. e. Does trail vary wlth sound? (spurts) Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a . Wings. b. Aer odynamic 11st of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aer ostatic lift (balloon or dir igible) . 15. P r opulslon. a. P r opeller or jet. b. Rotor. c. Aerodynamlc vanes (flapping or osclilating) (Katz Mayer effect). d. Visible eXhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical) . - 4 - (1) Size. (2) Shape. (3) Location. RESTRICTED RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b, Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. P lace of business. a. Employer or employee. 5. Pertinent hobbies. 6. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). Ability to determine: a . Color, b. Speed of moving obj ects. c . Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5 - RESTRICTED 8. (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object{s). (1) Sound. (2) Motion. (3) Glint of light. c . Degree of fatigue and duration of flight at time of sighting ln cases where observer ls airborne. 9. Witnesses. a . Addressees. b. Occupation. c. 10. Reliability. Comments of interrogator regarding the intelligence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn ls not observable, how long did the target stay in the turn and what was its speed? c . Note particularly any separation of distant target into several targets upon approach. Track all 1f possible. 2. If airborne when object sighted. a. Were there any r adar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft r eport. - 6 - RESTRICTED RESTRICTED 3. Local flight schedules of commerc1al, private and m1Utary aircraft flying ln viclnity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testlng devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other . 5. If object contacted earth, obtain son samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terraln where observed. c. Place where 1t contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentlons that might presum­ ably be construed as such). cl-!~ C. P. CABELL Major General, USAF Director of Intelligence, Office of Deputy Chief of Staff, Operations DISTRJBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelllgence, Department of State Dir ector of Intelllgence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 Am INTELLIGENCE REQUIB.EMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to s ightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enWlCiated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of IntelU­ gence, Headquarters United States Air Force. Cables wm contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED C9-'892,AF RESTRICTED (2) Supplementary written reports, pr epared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Alr For ce. (3) Commandlng General, Alr Materiel Command ls authorized direct contact with major Air Commands (over seas) and organizations under their control in connection with the development of information on this subject. c . Major Air Commands (ZI) (1) Reports wlll be forwarded direct to the Commanding General, Air Materiel Command, Wright- Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by Installations r eceiv­ ing information pertaining to the r equirements enunciated in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all r eports sent t o Air Materiel Command in accordance with these instruc­ tions wtll be forwarded at the same time t o the Director of Intelligence, Headquarters United states Air Force. (4) Written r eports wm be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the develop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addr essees ot.cyer than those of the United states Air For ce are r equested to forward repor ts direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 . (2) In order to reduce the time factor involved in transmission of this type of information it is r equested that, wher ever communications faciUties permit, subordinate elements be authorized to communicate r eports direct t o the Commanding General, Air Materiel Com­ mand. PART IT - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer' s position): a. Ground (1) City, town. - 2 - (2) Distance and direction fr om city or town, r oad, inter section, etc. (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and longitude. RESTRICTED RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proxlmity to land. 4. (Name city, country, etc.) Number of objects. Formation type (If any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. c. Apparent construction. d. Size. (1) (Sketch if possible) (Of what material or substance) Estimated size. (2) Size as it appeared from observer's view. 9. Direction of fllght. 10. Tactics or maneuvers. (Compared to known object) Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. • RESTRICTED - 3 - RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trall vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. Lights . 14. a. Reflected or attached. b. Luminous c. Blinked on and off ln r elation to speed. Support a. Wings. b. Aerodynamic Hst of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic 11.ft (balloon or dirigible) . 15. Propulsion. a. P r opeller or jet. b. Rotor . c. Aerodynamic vanes (flapping or osc1llat1ng) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stabHity. a. Fins b. Stabil!.zers (horizontal or ve rtical). (1) Size. (2) Shape. (3) - 4 - Location. RESTRICTED RESTR I CTED 17. 18. Air ducts. a. Slots. b. Duct openings. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, w};loosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Poss1b1Uty of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relattve to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. 6. 6. Employer or employee. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliablllty of observer. a. Sources. RESTRICTED RESTRICTED (1) Neighbors . (2) Pollce Dept. (3) FBI records. (4) 8. Employer. Notes relative to observer on: a. Sightings in gener al. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Rellablllty. 10. Comments of interrogator regarding the lntelllgence and character of per son interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay ln the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Tr ack all l.f possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft r eport. - 6 - RESTRICTED RESTRICTED 3. Local fllght schedules of commercial, private and mll1tary aircraft flying in vidnlty at the t ime. (Check Canadian activity l.f close to that border.) 4. Possible releases of testing devices in vlcinlty sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7 . Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place wher e 1t contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure s igned statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, Le., (any projections or extentlons that might pr esum­ ably be construed as such). e>:P~ C. P. CABELL Major General, USAF Dlrector of Intelligence, Office of Deputy Chief of Staff, Operations DISTRlBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central lntelllgence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director , Federal Bureau of Invest1gatlon RESTRICTED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertalning to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. " b. 2. To establish procedures for reporting such information. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated 1n Part II, as may be procur ­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll­ gence, Headquarters United Stat(:s Air Force. Cables wl.11 contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0- 3." RESTRICTED RESTRICTED (2) Supplementary wrltten reports, prepared on AF For m 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (over seas) and organizations under their control in connection with the development of information on this subject , c. Major Air Commands (ZI) (1) Reports wm be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations r eceiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all r eports sent to Air Materiel Command in accordance with these instruc­ tions wm be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written r eports will be submitted on AF Form 112. (6) Commanding Gener al, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the develop­ ment of information on this s ubject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air F orce Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it Ls r equested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com­ mand. PART II - REQUIB.EMENTS General 1. Date of s ighting. 2. Time of sightl.ng (zonal by 24 hr. clock). 3, Where sighted (observer 's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) Fr om building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of fllght. (2) Distance and direction fr om city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c . Sea 4. (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) Number of objects. Formation type (if any), sketch if possible. 6. Observable celestial phenomena or planets that may account for the slghtlng. (Local fac1lities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8, Appearance of object. a. Color. b. Shape. c. Apparent construction. d. Size. (1) (Sketch 1f possible) (Of what material or substance) Estimated size. (2) Slze as it appeared from observer's vlew. 9. (Compared to known object) Direction of fUght. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillatlng, fluttering,. evasive, aggressive, er ratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 - RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with som1d? 12. (spurts) Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. c . Reflected on cloud. d. Showed thru cloud. 13. Llghts. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a . Wlngs. b. Aer odynamic Ust of fuselage. c. Vertical Jet. d. Rotating cyllnder or cone. e . Aerostatic lift (balloon or dir igible). 15. Propulsion. a . P r opeller or jet. b. Rotor. c. Aer odynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 18. Control and stability. a. Flns b. Stabilizers (hor izontal or vertical) . (1) Size. (2) Shape . (3) Location. - 4 - RESTRICTED RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. 20. Intermittent. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business . a. 5. 6. Employer or employee. Per tinent hobbies. a. Is observer amateur astronomer, pl.lot, engineer, etc . b. Length of time engaged in hobby (experience). Abllity to determine: a. Color. b. Speed of moving objects. c . Size at distance. 7. Reliability of observer. a. Sources. RESTRICTE D - 5 - RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records. (4) 8. Employer. Notes relative to observer on: a. Sightings 1n general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at tlme of sightlng in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c . Reliability. 10. Comments of interrogator regarding the intelUgence and character of person interr ogated. Relative to Radar Sightings Re radars operating on ground. 1. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what r adius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c . Note particularly any separation of distant target into several targets upon appr oach, Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b, Give estimates of slze, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED RESTRICTED 3. Local night schedules of commercial, private and m111tary aircraft flying 1n vicinity at the time. (Check Canadian activity 1f close to that border.) 4. Possible releases of testing devices 1n vicinity sent aloft by Ordnance, Navy, Alr Force, Army, Weather Units, Research Organizations or any other. 6. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surroundlng terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. FormaUon if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any pr ojections or extentions that might presum­ ably be construed as such). c:1-?~ C. P. CABELL Major General, USAF Director of lntell1gence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of thls memorandum Is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, lncludlng the so-called "Flying Discs. 11 b. 2. To establish procedures for reporting such information. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January Hl48, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary r·eports should be forwarded as available by the most expeditious means consistent with the importance of the Information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll­ gence, Headquarters United Statc,s Air Force. Cables will contaln the phase, "Pass to COMGENAMC WRIGHT- PATTERSON AFB, DAYTON, OHIO, ATTN: MClAX0-3." RESTRICTED RESTRICTED (2) Supplementary written r eports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact wlth major Air Commands (overseas) and or ganizations under their contr ol in connection wlth the development of information on this subject. c . Major Air Commands (ZI) (1) Reports wm be forwarded direct to the Commanding Gener al, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv­ ing information perta ining to the r equirements enunciated in Part Il. (2) Copies of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command In accor dance with these instruc­ tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding Gener al, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizations unde r their control in connection with the develop­ ment of information on thls subject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are requested to forward r eports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is r equested that, wherever communications facUlties permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com­ mand. PART ll - REQUffiEMENTS General 1. Date of sighting. 2, Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. - 2 - (2) Distance and direction from city or town, road, intersection, etc . (3) From bullding (story), yard, etc. (4) Map coor dinates (if feasible) showing latitude and longitude. RESTRICTED RESTRICTED b. Al.r (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer' s aircraft. (4) Latitude and longitude. c. Sea 4. (1) Latitude and longitude. (2) Proximity to land. (Name clty, country, etc.) Number of objects. Formation type (if any), sketch If possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for s uch information.) 6. Distance of object from observer. ' a. Laterally or horizontally. 7. b. Angle of elevation from horizon. C. Altitude. Time in sight. 8. Appearance of object. a . Color. b. Shape. (Sketch if possible) c . Apparent construction. d. (Of what material or substance) Size. (1) Estimated size. (2) Size as l.t appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 - RESTRICTED 12. c. Odor (if any). d. Rate of evapor ation. e. Does trail vary with sound? (spurts) Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. c . Reflected on cloud. d. 13. Showed thru cl oud. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in r elation to speed. 14. Support a. Wings . b. Aerodynamic list of fuselage. c . Vertical jet. d. Rotating cylinder or cone. e . Aerostatic 11ft (balloon or dirigible) . 15. Propulsion. a . Propeller or jet. b. Rotor. c . Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stablll.ty. a. Fins b. Stabillzers (horizontal or vertical) . (1) Size. (2) Shape. (3) Locatlon. - 4 - RESTRICTED RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P .H. 19. Sound. a . Continuous whine or buzz. b. Roar, whistle, w}:loosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments . (2) Other physical evidence. b. Faded from view. C. Disappeared behlnd obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. 5. Employer or employee. Pertinent hobbles. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in bobby (experience). 6, Ablllty to determine: a . Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5 - RESTRICTED 8. (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. Notes relative to observer on: a, Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of Ught. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a . Addressees. b. Occupation. C. ReliabiUty. 10. Comments of interrogator regarding the intelUgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. D1d target executive any turns? If so, what angle (180°), etc . and what radius of turn. If radius of turn 1s not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. I.f airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. - 6 - Winds aloft report. RESTRICTED RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying 1n viclnlty at the time. (Check Canadian actlvlty 1f close to that border.) 4. Possible releases of testing devices in vicinlty sent aloft by Ordnance, Navy, Air For ce, Army, Weather Units, Research Organizations or any other . 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of solls. 6. If object came sufflclently near other aircraft or known objects check surfaces with Gelger counters for possible radioactivity. Make comparisons wlth other unaffected aircraft objects, et c . 7. Obtain photographs (or original negatives) wher e available; Ii not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (lf this happened). d. Maneuvers. e. Formation lf objects wer e more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, Le., (any projections or extentlons that might presum­ ably be construed as such). c>: P.~ C. P . CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE Affi F ORCE HEADQUARTERS UNITED STATES AIR FORCE DffiECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 Febr uary 1949 Affi INTELLIGENCE REQUIB.EMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AffiCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate contlnulng Air Force r equirements for information pertaining t o sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Dlscs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred t o Air Force agencies for action, ar e herewith super seded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the lnformation r eported. b. Major Air Commands (Over seas) and Air Attaches (1) Initial and supplementary cabled r eports will be transmitted to the Director of Intem­ gence, Headquarters United St at<::s Air Force . Cables will contain the phase, " Pass to COMGENAMC WRIGHT- PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3." RESTRICTED C9- IIH2,AF RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports w111 be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by installations receiv­ ing Information pertaining to the requirements enunciated in Part II. (2) Coples of such reports may be supplled the Command Headquarters of the Installation concerned. (S) A copy of all reports sent to Air Materiel Command in accordance with these Instruc­ tions wlll be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written r eports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the develop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addressees o~er than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to reduce the time factor involved in transmission of this type of information 1t is requested that, wherever communications fac1litles permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com­ mand. PART Il - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (If feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICfED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea 4. (1) Latitude and longitude. (2) Proxlml.ty to land. (Name city, country, etc.) Number of objects. Formation type (!.f any), sketch l.f possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local fac111ties or organizations which follow such celestial phenomena should be consulted for such information.) Distance of object from observer. 6. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time 1n sight. 8. Appearance of object. a. Color. b. Shape. c. Apparent construction. (Sketch l.f possible) (Of what material or substance) d. Sii.e. 9. (1) Estimated size. (2) Sl.ze as lt appeared from observer's view. (Compared to known object) Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. 1 a. Color of smoke. b. Length and width. RESTRICTED - 3 - RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. 13. a. Opened path thru clouds. b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud . Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support 15. a. Wings. b. Aerodynamic 11st of fuselage. c. Vertical jet. d. Rotating cylinder or cone . e. Aerostatic lift (balloon or dirigible) . P r opulsion. a. P r opeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect) . d. Visible exhaust or jet openings. 16. Control artd stability. a. F!.ns b. Stabilizers (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. 5. Employer or employee. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. AbHity to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliab111ty of observer . a. Sources. RESTRICTED - 5 - RESTRICTED 8. (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. Notes relative to observer on: a . Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of slghtlng in cases where observer ls airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Rellablllty. 10. Comments of interrogator regarding the intelllgence and character of person interrogated. Relative to Radar Sightings Re radars operating on ground. 1. a. Observations of range, speed, altitude and size of target. b. Did target executive any tw-ns? If so, what angle (180°), etc . and what radius of turn. If radius of turn ls not observable, how long did the target stay in the turn and what was its speed? c . Note particularly any separation of distant target into several targets upon approach. Track all if possible. If airborne when object sighted. 2. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED RESTRICTED 3. Local filght schedules of commercial, private and mmtary aircraft flylng In vicinity at the time. (Check Canadian activity If close to that border.) 4. Possible releases of testing devices In vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils . 6. 11 object ca.me sufficiently near other aircraft or known objects check surfaces with Gelger cowiters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; 1f not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where lt contacted earth (lf this happened). d. Maneuvers. e . Formation Ii objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible . 10. Was any r adio antenna to be observed, Le. , (any projections or extentlons that might presum­ ably be construed as such). C. P. CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Gener als, Major Air Commands, ZI and Overseas All United States Air Attaches Dir ector of Central Intelligence Special Assistant for Research and IntelUgence, Department of State Director of Intell1gence, GSUSA Chief of Naval Intelllge nce Commandant (INT), United States Coast Guard DI.rector, Federal Bureau of Investigation RESTRIC TED - 7 - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INI'ELLIGENCE WASHINGTON 25, D. C . 15 Febr uary 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum Is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentlfied flying objects, including the so-called "Flying Discs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Nwnber 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March HM8, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll­ gence, Headquarters United States Air Force. Cables wm contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3. " RESTRICTED Cll-11892, AF RESTRICTED (2) Supplementary wr1tten reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and or ganizations under their control in connection with the development of information on this s ubject. c. Major Air Commands (ZI) (1) Reports wlll be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations r eceiv­ ing information pertaining to the r equirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all r eports sent to Air Materiel Command in accordance with these instruc­ tions wlll be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command 1s authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this s ubject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are r equested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order t o reduce the time factor involved in transmission of this type of information it is requested that, wher ever communications fac111ties permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com­ mand. PART II - REQUIREMENTS General 1. Dat e of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, r oad, intersection, etc. (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. Air (1) Type aircraft, speed, altltude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. 4. (Name city, country, etc.) Number of objects. Formation type (if any), sketch if possible. 6. Observable celestial phenomena or planets that may account for the sighting. (Local facillties or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. d. (Of what material or substance) Size. (1) Estimated size. (2) Size as it appeared from observer's view. 9. (Compared to known object) Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. • RESTRICTED - 3 - RESTRICTED 12. C. Odor (if any). d. Rate of evaporation. e. Does trail va:ry with sound? (spurts) Effect on clouds. a. Opened path thru clouds. b. For ced cloud or mists . c. Reflected on cloud. d . Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off ln r elation to speed. 14. Support a . Wings. 15. b. Aerodynamic list of fuselage. c. Vertical jet , d. Rotating cylinder or cone. e. Aer ostatic lift (balloon or dirigible) . P r opulsion. a. P ropeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect ). d. Visible exhaust or Jet openings. 16. Control and stability. a. Fins b. Stabillzers (horizontal or vertical). (1) Size. (2) Shape . (3) Location. - 4 - RESTRICTED RESTRICTED 17. Air ducts. a. Slots. b . Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, wl;loosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c . Disappeared behind obstacle. Relative to the Observer 1. Name of observer . 2. Address. 3, Occupatlon. 4. P lace of business. a. 5. Employer or employee. Per tinent hobbies. a . Is observer amateur astronomer, pl.lot, engineer , etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. c. 7. Size at distance . Reliabi11ty of observer . a. Sources. RESTRIC T ED - 5 - RESTRICTED 8. (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer ls airborne. 9. Witnesses. a. Addressees. b. Occupation. C. Reliablllty. 10. Comments of interrogator regarding the lntelllgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Tr ack all if possible. 2. I! airborne when object sighted. a. Were there any radar inductions or extra noise on radlo circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED RESTRICTED 3. Local fl1ght schedules of commercial, private and military aircraft flying ln vicfnity at the time. (Check Canadian activity 1f close to that border.) 4. Possible r eleases of testing devices 1n vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. Ii object contacted earth, obt ain soil samples within and without depr ession or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. ?. Obtain photographs (or original negatives) where available; 1f not, secure sketches of: a . Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation 1f objects wer e more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any r adio antenna to be observed, i.e ., (any projections or extentions that might presum­ ably be construed as such). C. P . CABELL Major General, USAF Director of Intel11gence, Office of Deputy Chief of Staff, Operations DISTRlBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelllgence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - ? - RESTRICTED RESTRICTED RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for informatlon pertaining t o sightings of unconventional aircraft and unldentifi.ed flying objects, including the so- called "Flying Discs.,, b. 2. To establish procedures for reporting such information. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and l etter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies f or action, are herewith super seded. 3. REPORTING a. General (1) As compl ete an answer to the requirements enunciated in Part Il, as may be procur­ able, should be dispatched by means of electrical transmissi on immediately after sightings, (2) Supplementary r eports should be forwarded as available by the most expeditlous means consistent with the importance of the information r eported. b. Major Air Commands (Over seas) and Air Attaches (1) Initial and supplementary cabled r eport s will be transmitted to the Director of Intelli­ gence, Headquarters United States Air Force. Cabl es wlll contain the phase, " Pass t o COMGENAMC WRIGHT- PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0- 3.' ' RESTRICTED ce-,as2,AF ha ff 1K 9~-/t''/ r RESTRICTED (2) Supplementary written r eports, prepared on AF Form 112, wm be forwarded to the Director of IntelHgence, Headquarters United States Air Force. (3) Commanding General, Alr Materiel Command ls authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Alr Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc­ tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otter than those of the United States Air Force are r equested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilltles permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Alr Materiel Com­ mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of slghtl.ng (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTE D RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of fUght . (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) 4. Proximity to land. (Name city, country, etc.) Number of objects. Formation type (If any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilltles or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c . Apparent constructlon. d. 9. (Of what material or substance) Size. (1) Estimated s ize. (2) Size as it appeared from observer's view. (Compared to known object) Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratlc, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 - RESTRICTED 12. Odor (if any). d. Rate of evaporatlon. e. Does trail vary with sound? (spurts) Effect on clouds. a. Opened path thru clouds . b. For ced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. 14. c. Lights. a. Reflected or attached . b. Luminous c. Blinked on and off in relation to s peed. Support a. Wings . b. Aerodynamic list of fuselage. c . Vertical jet. 15. 16. d. Rotating cylinder or cone. e. Ae rostatic lift (balloon or dirigible) . Propulsion. a. Propeller or jet . b. Rotor . c. Aerodynamic vanes (-flapping or oscl.llating} (Katz Mayer effect). d. Visible exhaust or jet openings. Contr ol and stability. a. Fins b. Stabilizers (hor izontal or vertical). (1) Size. (2) Shape. (3) - 4 - Location. RESTRICTED RESTRICTED 17. Air ducts. a. Slots. b. 18. Duct openings. Speed - M.P .H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3, Occupation. 4. Place of business. a. 5. 6. Employer or employee. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). Ab111ty to determine: a. Color. b. Speed of moving objects. c. 7. Size at distance. Reliabillty of observer. a. Sources. RESTRICTED - 5 - RESTRICTED (1) Neighbors. (2) Pollce Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on; a. Sightings In general. b. How attention was drawn to object(s). (1) Sound, (2) Motion. (3) Glint of Ught. c. Degree of fatigue and duration of flight at time of sighting in cases where observer ls airborne. Witnesses. 9. 10. a. Addressees. b. Occupation. c. Reliablllty. Comments of Interrogator regarding the l.ntell1gence and character of person Interrogated. Relative to Radar Sightings Re radars operating on ground. 1. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was I.ts speed? c, Note particularly any separation of distant target into several targets upon approach. Tr ack all l.f possible. If airborne when object sighted. 2. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of slze, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather condtuons. 2. Winds aloft report. - 6 - RESTRICTED RESTRICTED 3. Local flight schedules of commercial, private and military aircra!t flying 1n vicinity at the time. (Check Canadian activity 1f close to that border.) 4. Possible releases of testing devices 1n vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or s pot where object landed (and then presumably departed) for purpose of making c omparison of soils. 6. 11 object came sufficiently near other alrcra!t or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected a1rcra!t objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (If this happened). d. Maneuvers. e. Formation 1f objects were mor e than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence wher e possible. 10. Was any radio antenna to be observed, Le ., (any projections or extentl.ons that might presum­ ably be construed as such). C. P. CABELL Major General, USAF Director of Intelligence, Office of Deputy Chief of Sta!f, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelllgence, GSUSA Chief of Naval Intelligence Commandant {INT), United States Coast Gua