The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. February 28, 1963 at 21:48 UTC · Launch Failure Thor SLV-2A Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 1E, Vandenberg SFB, CA, USA The world's 231st orbital launch attempt, and 7th of 1963. Data: Launch Library 2, The Space Devs. Image via The Space Devs.