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NASA astronaut Mark Kelly, STS-134 commander, speaks to reporters during a news conference at NASA's Johnson Space Center. Peggy Whitson, Astronaut Office chief, is seated next to Kelly. The briefing was held to discuss Kelly resuming training as the STS-134 shuttle mission commander. With the exception of some proficiency training, Kelly has been on personal leave since Jan. 8 to care for his wife, congresswoman Gabrielle Giffords, who was critically wounded in a Tucson, Ariz. shooting. Photo credit: NASA or National Aeronautics and Space Administration