STS-127 crew members

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. (Credit: NASA/Kim Shiflett)