The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. June 12, 1963 at 23:58 UTC · Launch Successful Thor SLV-2A Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 1W, Vandenberg SFB, CA, USA The world's 252nd orbital launch attempt, and 28th of 1963. Data: Launch Library 2, The Space Devs. Image via The Space Devs.