'Information, not verifiable, has reached Hq USAF that persons claiming to represent the Air Force or other Defense establishments, have contacted citizens who have sighted unidentified flying objects. In one reported case, an individual in civilian clothes, who represented himswelf as a member of NORAD, demanded and recieved photos belonging to a private citizen. In another, a person in an Air Force uniform approached local police and other citizens who had sighted a UFO, assembled them in a school room and told them that they did not see what they thought they saw and that they should not talk to anyone about the sighting. All military and civilian personnel and particularly Information Officers and UFO Investigating Officers who hear of such repots should immediately notify their local OSI offices."
Lt. General Hewitt T. Wheless, assistant Vice Chief of Staff of the United States Air Force - memo to defense agencies, including Strategic Air Command (SAC) - March 1, 1967.