STS_135_NBL

NASA astronaut Rex Walheim prepares to train in the Neutral Buoyancy Laboratory near the Johnson Space Center on Thursday, March 10, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool )

JSC2011-E-040211 (10 March 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, prepares to train in the Neutral Buoyancy Laboratory (NBL) near NASA?s Johnson Space Center in Houston March 10, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

Photographer Smiley N. Pool
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