On Launch Pad 39A at NASA's Kennedy Space Center listen to instructions about emergency exit.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-127 crew members listen to instructions about emergency exit from the shuttle. Standing from left to right are Commander Mark Polansky, Mission Specialists Tom Marshburn, Christopher Cassidy, Tim Kopra and Julie Payette, and Pilot Doug Hurley. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency exit training and equipment familiarization. Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett