U.S. Government Journal UFO Article:

“UNIDENTIFIED FLYING OBJECTS (UFOs)”

The Inspector General (TIG) Brief, 
Number 21, Volume XVIII, 14 October 1966

(U.S. Air Force, Washington, D.C.)

Source: CUFON.org, U.S.A.

The Inspector General Brief reports on Air Force Regulation 
80-17 (AFR 80-17, 19 September 1966):

http://www.cufon.org/cufon/tig_brief4.htm

(cufon.org image)