C-135C, USAF s/n 61-2669, of the 4950th Test Wing Detachment 1, Andrews AFB. These images taken at Edwards AFB in January 1982. The aircraft was known as Speckled Trout, accomplishing test missions for advanced communications and navigation systems. It was also the primary transport for the Chief of Staff of the USAF. The Trout often executed testing while performing VIP transport flights.
Highly polished fuselage sides and fan sections of the engine nacelles.
Infra-Red countermeasures units on each of the engine pylons...
It's not obvious in the images above but the serial presentation on the tail and the United States Air Force legend on the fuselage are in medium blue with black shadowing...
Thanks for looking,
Sven