Atlas is a family of U.S. space launch vehicles. The original Atlas missile was designed in the late 1950s. It was a liquid-fuel rocket burning LOX and RP-1 in three engines configured in an unusual “stage-and-a-half” or “Parallel Staging” design: two of its three engines were jettisoned during ascent, but its fuel tanks and other structural elements were retained. Various Atlas II models were launched 63 times between 1991 and 2004. There were only 6 launches of the Atlas III, all between 2000 and 2005. The Atlas V is still in service, with launches planned through 2011.

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