The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. August 2, 1962 at 00:17 UTC · Launch Successful Thor Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2E, Vandenberg SFB, CA, USA The world's 184th orbital launch attempt, and 42nd of 1962. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.