NASA astronaut Rex Walheim, STS-135 mission specialist, is pictured during the STS-135 crew return ceremony on July 22, 2011 at Ellington Field near NASA's Johnson Space Center.
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NASA astronaut Rex Walheim, STS-135 mission specialist, is pictured during the STS-135 crew return ceremony on July 22, 2011 at Ellington Field near NASA's Johnson Space Center.