ELINT/SIGINT satellite using a tube-type F1 receiver with S-band horn antennas. June 18, 1962 at 20:20 UTC · Launch Successful Thor DM-21 Agena-B — United States Air Force, to Low Earth Orbit Space Launch Complex 1E, Vandenberg SFB, CA, USA The world's 173rd orbital launch attempt, and 31st of 1962. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.