KH-5 (Keyhole 5, codenamed Argon) was the area survey component of the Corona program. April 26, 1963 at 20:12 UTC · Launch Failure Thor Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2E, Vandenberg SFB, CA, USA The world's 242nd orbital launch attempt, and 18th of 1963. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.