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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.
“King”1 page
RESTRIC TE D 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. For ced cloud or mists . c . Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Bllnked on and off in relation to speed. 14. Support a. Wings. b. Aer odynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aer ostatic lift (balloon or dirigible). 15. P r opulsion. a. P r opeller or jet . b. Rotor . c . Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Vlslble exhaust or jet openings. 16. Cont rol and stability. a . Fins b. Stabilizer s (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED
Document, cited by the archive. The PDF is mirrored here; the original link is above. 137 pages are in the text index: search them above, or from the library's search.