JSC2010-E-181466 (27 Oct. 2010) --- NASA astronaut Chris Ferguson, STS-135 commander, helps NASA astronaut Sandy Magnus, mission specialist, don a training version of her 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. Photo credit: NASA or National Aeronautics and Space Administration