KH-5 (Keyhole 5, codenamed Argon) was the area survey component of the Corona program. August 21, 1964 at 15:45 UTC · Launch Successful Thor SLV-2A Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2W, Vandenberg SFB, CA, USA The world's 350th orbital launch attempt, and 57th of 1964. Data: Launch Library 2, The Space Devs. Image via The Space Devs.