JSC2011-E-028157 (23 March 2011) --- NASA astronaut Greg H. Johnson (left), STS-134 pilot; along with European Space Agency astronaut Roberto Vittori (second left) and NASA astronauts Andrew Feustel and Greg Chamitoff (seated), all mission specialists, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration
Photographer DAVID DeHOYOS
Date March 23, 2011