The Atlas-Agena was an American expendable launch system derived from the SM-65 Atlas missile. It was a member of the Atlas family of rockets, and was launched 109 times between 1960 and 1978. It was
An Atlas-Agena launching Lunar Orbiter 4
Atlas-Agena B upper stage on display at the Steven F. Udvar-Hazy Center
Ranger block I spacecraft bus was used for the first two Rangers, and also for the first two Mariner interplanetary probes
Mariner 3, 4, and 5 spacecraft bus
The Agena Target Vehicle, also known as Gemini-Agena Target Vehicle, was an uncrewed spacecraft used by NASA during its Gemini program to develop and practice orbital space rendezvous and docking tech
Atlas-Agena
…probes to the planets Venus and Mars, and the Ranger and Lunar Orbiter uncrewed probes to the Moon. The upper stage was also used as an uncrewed orbital target vehicle for the Gemini crewed spacecraft to practice rendezvous and docking. However, the launch vehicle family was originally developed for the Air Force and…
An Atlas-Agena launch vehicle launches GATV-5006 into orbit for the Gemini 11 mission.
The ATDA in orbit as seen from Gemini 9A, above Caracas, Venezuela, the Venezuelan Coastal Range, Isla La Orchila, and the Los Roques Archipelago. The white parts are the partially-opened shroud. The photo is mirrored.