The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. May 30, 1962 at 01:00 UTC · Launch Successful Thor DM-21 Agena-B — United States Air Force, to Low Earth Orbit Space Launch Complex 2E, Vandenberg SFB, CA, USA The world's 169th orbital launch attempt, and 27th of 1962. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.