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National Aeronautics and Space Administration Administrator (NASA) Charles Bolden lays a wreath at a Challenger memorial, at Arlington National Cemetery, in Arlington, Va., Thursday, Jan. 27, 2011, in commemoration of NASA's National Day of Remembrance.  (AP Photo/Manuel Balce Ceneta)
Photo by: Manuel Balce Ceneta
National Aeronautics and Space Administration Administrator (NASA) Charles Bolden lays a wreath at a Challenger memorial, at Arlington National Cemetery, in Arlington, Va., Thursday, Jan. 27, 2011, in commemoration of NASA's National Day of Remembrance. (AP Photo/Manuel Balce Ceneta)

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