Last updated on April 24, 2014 at 13:35 EDT
Delta II Solid Rocket Motors
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Delta II Solid Rocket Motors

January 15, 2013
At Space Launch Complex-2 at Vandenberg Air Force Base in California, technicians assist as a solid rocket motor is attached to the United Launch Alliance Delta II rocket. The Delta II will carry NASA’s National Polar-orbiting Operational Environmental Satellite System Preparatory Project (NPP) satellite into space. Image credit: NASA/Mark Mackley,VAFB Aug. 1, 2011