Stock Photo - NASA astronaut Rex Walheim, STS-135 mission specialist, dons a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program.

Stock Photo: NASA astronaut Rex Walheim, STS-135 mission specialist, dons a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a.

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