Stock Photo - NASA astronaut Chris Ferguson, STS-135 commander, participates in a training session in 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 Chris Ferguson, STS-135 commander, participates in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

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