On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-127 Mission Specialist Christopher Cassidy is eager to take part in the simulated launch countdown, which concludes the terminal countdown demonstration test. 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