U.S. Government UFO Document:
“UNIDENTIFIED FLYING OBJECTS, 
AIR FORCE REGULATION 80-17, 
DEPARTMENT OF THE AIR FORCE, 
Washington, D.C., 19 September 1966)” 
(United States Department of Defense, Washington, D.C.)
(NICAP.org)

This regulation established the U.S. Air Force programme for investigating and analysing UFOs over the U.S.:

http://www.nicap.org/afr80-17.htm

Harold Brown (Democrat) was U.S. Secretary of the Air Force from 1 October 1965 to 15 February 1969.

The Pentagon (2008), Arlington, Virginia
(wikimedia.org photo)