STS-127 crew members

STS-127 crew members walk toward the Astrovan that will taken them to Launch Pad 39A at NASA's Kennedy Space Center in Florida for a simulated launch countdown. In the foreground are Pilot Doug Hurley (left) and Commander Mark Polansky. Behind them are Mission Specialists Christopher Cassidy, Tim Kopra, Tom Marshburn, Dave Wolf and Julie Payette, who represents the Canadian Space Agency. 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)