NASA astronauts Michael Barratt left STS-133 mission specialists members participate at NASA's Johnson Space Center.

NASA astronauts Michael Barratt (left) and Alvin Drew (center), both STS-133 mission specialists, members participate in a training session in the fixed-base shuttle mission simulator (SMS) and the Space Station Training Facility (SSTF) in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration