STS-135 crew during various training exercises in Space Station Training Facility

STS-135 crew during various training exercises in Space Station Training Facility Rack Buildup Area, including CGBA, Micro 4, NLP-VAC, Payload Transfer and Cube Lab. Photo Date: March 21, 2011. Location: Building 5, Space Station Training Facility (SSTF) Rack Buildup. Photographer: Robert Markowitz.

JSC2011-E-029062 (21 March 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, participates in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Crew instructors assisted Magnus. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

Photographer ROBERT MARKOWITZ