The seven-member crew of STS-118 is set to arrive at NASA's Kennedy Space Center in Florida on Monday for the terminal countdown demonstration test. Often referred to as TCDT, the test is a final round of prelaunch training that concludes with a simulated launch countdown for the crew and the launch team.

Image above: Space Shuttle Endeavour stands at Kennedy Space Center's Launch Pad 39A. Photo credit: NASA/Ken Thornsley

Space Shuttle Endeavour arrived at Launch Pad 39A early July 11 after an overnight rollout from the Vehicle Assembly Building. The STS-118 payload -- including the S5 truss, SPACEHAB module and external stowage platform 3 -- was delivered July 8 to the pad's payload changeout room.

The STS-118 mission will be the 22nd flight to the International Space Station and first flight for Endeavour since 2002. Launch is targeted for the evening of Aug. 7.

Image above: The crew members of STS-118 pose for their official portrait. Pictured from the left are mission specialists Richard A. (Rick) Mastracchio, Barbara R. Morgan, Pilot Charles O. Hobaugh, Commander Scott J. Kelly and mission specialists Tracy E. Caldwell, Canadian Space Agency's Dafydd R. (Dave) Williams, and Alvin Drew Jr. Credit: NASA

Space Shuttle Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment.

U.S. Navy Commander Scott J. Kelly will command the seven-person crew of STS-118. U.S. Marine Corps Lt. Col Charles O. Hobaugh will be Endeavour's pilot. Veteran astronauts Richard A. Mastracchio and Dr. Dafydd (Dave) Williams of the Canadian Space Agency will be returning to space for their second missions. Barbara R. Morgan, Tracy E. Caldwell, Ph. D., and Benjamin Alvin Drew round out the crew as mission specialists.