At NASA's Kennedy Space Center wait before heading to Launch Pad 39A for a simulated launch countdown.

At NASA's Kennedy Space Center in Florida, STS-127 crew members wait in front of the Astrovan for a final photograph before heading to Launch Pad 39A for a simulated launch countdown. From left are Mission Specialists Dave Wolf, Tim Kopra, Tom Marshburn, Christopher Cassidy and Julie Payette, Pilot Doug Hurley and Commander Mark Polansky. 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 scheduled for June 13 at 7:17 a.m. EDT. Photo credit: NASA/Kim Shiflett