KH-6 (Keyhole 6, codenamed Lanyard) was an early attempt to gain higher resolution imagery, which flew only one successful mission in 1963. It was part of the Corona program. July 31, 1963 at 00:00 UTC · Launch Successful Thor SLV-2A Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2W, Vandenberg SFB, CA, USA The world's 265th orbital launch attempt, and 41st of 1963. Data: Launch Library 2, The Space Devs. Image via The Space Devs.