I can remember seeing the Habu's strutting around the O'Club at Mildenhall in their international orange flight suits in the late 1970's.
https://airandspace.si.edu/collectio...ates-air-force
I was at the RAF Mildenhall Air Fete in 1977 which had the F-16 demonstrator and the YC-14 and YC-15 on display. SR-71 17958 (61-7958) was parked on the display ramp with appropriate security.
An Air Force pilot in uniform was at the nose of the plane and an apparent young airman in civvies struck up a conversation. He said he was from some photo unit back in the States and asked if the photo interpreters from Beale were deployed with the detachment. The pilot was obviously uncomfortable and annoyed at this public discussion. The airman persisted and the pilot said let me get your name and unit and I'll check and see if your friends are here. He then escorted the inquisitive spectator into the hangar for what I presume was a little debriefing with security personnel. Probably unrelated but our Navy spooks later told us that a Soviet general was escorted around the planes by an RAF air attaché.
From one of Paul Crickmore's books, when I observed this static display conversation in May of 1977 a Mobile Processing Center had just been deployed to Mildenhall under the direction of the Joint Chiefs of Staff to process the take from PARPRO missions. Maybe just an airman looking for his buddies in the business but it was a very sensitive subject in retrospect.
Photo by Ian Cole