Mark Kelly, commander of space shuttle Endeavour on STS-134

NASA astronaut Mark Kelly smiles during a news conference where it was announced that he will resume training as commander of the STS-134 space shuttle mission at the Johnson Space Center in Houston February 4, 2011. Kelly has been on leave from NASA caring for his wife, U.S. Congresswoman Gabrielle Giffords, who was critically wounded in a Tucson, Arizona shooting.
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