Atlantis: Ready for Launch
The crew of space shuttle Atlantis, from left, mission specialist Rex Welhiem, pilot Doug Hurley, mission specialist Sandy Mangus and commander Chris Ferguson gather for a photo after 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)
