201107070009hq (7 July 2011) --- Chris Cassidy lays down grease on the tracks of the rotating service structure (RSS) on Launch Pad 39A at the NASA Kennedy Space Center prior to the RSS being rolled back to reveal the space shuttle Atlantis on July 7, 2011. Atlantis is set to liftoff July 8 on the final flight of the Space Shuttle Program, STS-135, a 12-day mission to the International Space Station. Photo credit: NASA/Bill Ingalls