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Delta II First Stage
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Delta II First Stage

January 15, 2013
At NASA's Space Launch Complex-2 on Vandenberg Air Force Base in California, workers secure the Rocketdyne engine in the first stage of a United Launch Alliance Delta II. The rocket will carry NASA's National Polar-orbiting Operational Environmental Satellite System Preparatory Project (NPP) satellite into space. Image credit: NASA/Mark Mackley,VAFB July 20, 2011


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