Atlantis: Ready for Launch
The crew of space shuttle Atlantis, from left, commander Chris Ferguson, mission specialist Sandy Mangus, mission specialist Rex Welhiem and pilot Doug Hurley, go through safety training in the M113 personnel carrier during the Terminal Countdown Demonstration Test at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, June 21, 2011. The vehicle would be used by the crew in the event of an emergency at the pad during which the crew must make a quick exit from the area. (AP Photo/John Raoux)
