 These were the final launches of Atlas-Agena vehicles aside from the one-off Atlas F/Agena used to launch Seasat.Vela consisted of two sets of Air Force satellites flown in 1964-65 to monitor Soviet compliance with the Nuclear Test Ban Treaty on Atlas-Agena Ds.Snapshot was a one-off Air Force test of a nuclear satellite flown in 1965 on an Atlas-Agena D.