Pictures of Cold War aircraft.

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U.S. Air Force Captain Steve Ritchie, 30, of Reidsville, North Carolina, the Air Force's first Vietnam War ace, stands
by five stars painted on his jet at Saigon's Tan Son Nhut airbase in Vietnam, Tuesday, August 29, 1972. Ritchie
shot down his fifth North Vietnamese MiG on Monday.

 
Feb 6 1991, Saudi Arabia. KC-135 callsign 'Whale 05' encounters severe wake turbulence at 25,000 feet. In seconds, it banks
over 90 degrees in both directions and engines number 1 and 2 are ripped off the wing. Speed brakes are deployed and
the captain regains control, safely landing at Jeddah AFB.

 
What in the world caused those discolored panels?

They follow the lines of panels and joins, which leads me to suspect they might be an anti-corrosive agent placed around the panel lines directly onto the aircraft. A common anti-corrosive agent was Dinitrol, which is liquid but dries into a wax like substance. It can be brushed on or sprayed on from a can. It produces a reddish brown tinge, like in the undercarriage bay of this C-130:

Herc nose wheel

Alternatively it could be an application of zinc chromate paint for the same reason, anti-corrosive measures...
 
What in the world caused those discolored panels?

Yes, a guy on the post where I saw that pic made this comment:

it's can sprayed Zinc Chromate Primer, intended to prohibit corrosion on panels/joints that are frequently accessed. Plane captains were admonished if such areas were not sprayed while underway/deployed.
 
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