The KH-4A (Keyhole-4A) was the fifth optical reconnaissance satellite version in the Corona-program. May 18, 1965 at 18:02 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 435th orbital launch attempt, and 42nd of 1965. Data: Launch Library 2, The Space Devs. Image via The Space Devs.