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CAPE CANAVERAL, Fla. -- The final astronaut to board a space shuttle for flight, STS-135 Mission Specialist Rex Walheim, bids farewell to the Closeout Crew in the White Room of Launch Pad 39A. All three of Walheim's missions -- STS-110, STS-122 and now STS-135 -- will have been aboard space shuttle Atlantis. Four STS-135 crew members are scheduled to lift off at 11:26 a.m. EDT on July 8 for a mission to the International Space Station. STS-135 will deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts for the International Space Station. Atlantis also will fly the Robotic Refueling Mission experiment that will investigate the potential for robotically refueling existing satellites in orbit. In addition, Atlantis will return with a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Sandra Joseph and Kevin O'Connell