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Delta II Second Stage Engine
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Delta II Second Stage Engine

January 15, 2013
At Vandenberg Air Force Base in California, technicians monitor the progress as the AJ10 engine for the second stage of a United Launch Alliance Delta II rocket is hoisted up in the service tower at NASA’s Space Launch Complex-2. The Delta II will carry NASA's National Polar-orbiting Operational Environmental Satellite System Preparatory Project (NPP) satellite into space. Image credit: NASA/VAFB Aug. 2, 2011