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. May 18, 1963 at 22:21 UTC · Launch Successful Thor SLV-2A Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 1E, Vandenberg SFB, CA, USA The world's 247th orbital launch attempt, and 23rd of 1963. Data: Launch Library 2, The Space Devs. Image via The Space Devs.