Astronaut Tom Marshburn

JSC2012-E-034747 (14 March 2012) --- NASA astronaut Tom Marshburn, Expedition 34/35 flight engineer, wearing a training version of the Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Photo credit: NASA