The space shuttle Atlantis rolls back from launch pad 39A to the Vehicle Assembly Building for repairs to the external tank at the Kennedy Space Center in Cape Canaveral, Florida March 4, 2007. (Xinhua Photo)
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A NASA security officer keeps guard as the space shuttle Atlantis rolls back from launch pad 39A to the Vehicle Assembly Building for repairs to the external tank at the Kennedy Space Center in Cape Canaveral, Florida March 4, 2007. (Xinhua Photo)
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