The Atlantis shuttle flight on November 15, 1990 also carried a couple super classified payload--including "a stealthy satellite inspection spacecraft, often referred to as “Prowler”, designed to sneak up on other satellites undetected, photographing and measuring them"--that was symbolized by the darkened mirror image of the shuttle in the official mission patch. NASA's party line was that the "bottom orbiter, a black and white mirror image, acknowledges the thousands of unheralded individuals who work behind the scenes." But there was actually another SECRET patch.
But NASA has never disclosed that there was also a secret patch designed for this mission: an emblem that had a darker border (Figure 2). Most notably, the shuttles were inverted, with the black orbiter—the classified mission—on top, and the white orbiter on the bottom. It was an inside joke by the all-military crew about the true nature of their mission.
No Golden Eye?
[Via]