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This FBI file serial 164 in 62-HQ-83894 holds several copies of Air Intelligence Requirements Memorandum Number 4, "Unconventional Aircraft," issued 15 February 1949 by the Directorate of Intelligence, Headquarters United States Air Force. Major General C. P. Cabell signed it. It sets out continuing Air Force requirements for information on unconventional aircraft and unidentified flying objects, including "Flying Discs," and tells commands and outside agencies to send reports to the Air Materiel Command at Wright-Patterson AFB. It also lists detailed reporting questions on sightings, observers, radar data and physical evidence.
“ROTOR”17 pages
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 (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc .) 4. 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. 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 ti possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as Lt appeared from observer's view. (Compared to known object) Q. 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 -
Document, cited by the archive. The PDF is mirrored here; the original link is under it. 137 pages are in the text index: search them above, or from the library's search.