The KH-4A (Keyhole-4A) was the fifth optical reconnaissance satellite version in the Corona-program. June 19, 1964 at 23:18 UTC · Launch Successful Thor SLV-2A Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2E, Vandenberg SFB, CA, USA The world's 332nd orbital launch attempt, and 39th of 1964. Data: Launch Library 2, The Space Devs. Image via The Space Devs.