Atlas-Agena D combined Atlas D, SLV-3, or stretched SLV-3C first stages with Lockheed's standardized, restartable Agena D upper stage. NASA used it for Mariner 3 through 5, Gemini Agena target vehicles, Lunar Orbiter 1 through 5, ATS 1 through 3, OAO 1, and OGO 5; later operational missions extended the family through 1978.