Those groovy late 70s- early 80s camo schemes
The Air Force had a lot of stuff going on in the Carter/Reagan-era:

A U-2C painted in a gray camouflage pattern called the “Sabre” scheme in 1975. The camouflage replaced the usual black finish to ease British concerns about “spy planes” operating from the UK. In Europe, this U-2 tested equipment to locate and suppress enemy surface-to-air missiles. (U.S. Air Force photo 070712-F-1234P-014)

