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The sign accompanying the LR-105 engine. It reads

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Atlas Sustainer Engine

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 6 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. Produces 57,000 lb of thrust.

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The traditional Atlas series went from Atlas A through Atlas F, and was replaced in 1990 with the Atlas I. The LR-105 was replaced in the Atlas I, and has not been used since.

The Atlas V continues to be in service, with five launches as of September 13, 2012. The United Launch Alliance also has a pamphlet entitled Atlas I to Atlas V: The Path to an Affordable and Operationally Efficient Launch System [direct link to 750K PDF].