- Family: Atlas
- Length: 47.54 m
- Diameter: 3.04 m
- Launch Mass: 204 T
- Low Earth Orbit Capacity: 6580 kg
The Atlas IIA was manufactured by Lockheed Martin with the first launch on 1992-06-10. Atlas IIA has 23 successful launches and 0 failed launches with a total of 23 launches. Atlas II was a member of the Atlas family of launch vehicles, which evolved from the successful Atlas missile program of the 1950s. It was designed to launch payloads into low earth orbit, geosynchronous transfer orbit or geosynchronous orbit. Sixty-three launches of the Atlas II, IIA and IIAS models were carried out between 1991 and 2004; all sixty-three launches were successes, making the Atlas II the most reliable launch system in history.