July 12, 1961 at 15:11 UTC · Launch Successful Atlas LV-3 Agena B — United States Air Force Space Launch Complex 3E, Vandenberg SFB, CA, USA The world's 116th orbital launch attempt, and 23rd of 1961. Data: Launch Library 2, The Space Devs. Image by NASA (NASA Image and Media Guidelines) via The Space Devs.