KH-5 (Keyhole 5, codenamed Argon) was the area survey component of the Corona program. July 21, 1961 at 22:35 UTC · Launch Failure Thor DM-21 Agena-B — United States Air Force, to Low Earth Orbit Space Launch Complex 1W, Vandenberg SFB, CA, USA The world's 117th orbital launch attempt, and 24th of 1961. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.