Accompanying space shuttle Atlantis on its rollout to Launch Pad 39A are from left.

Accompanying space shuttle Atlantis on its "rollout" to Launch Pad 39A at NASA's Kennedy Space Center in Florida are from left, STS-135 Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialists Sandy Magnus and Rex Walheim. It will take the crawler-transporter about six hours to carry the shuttle stack to its seaside launch pad.

The milestone move, known as "rollout," paves the way for the launch of the STS-135 mission to the International Space Station, targeted for July 8. 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: Courtesy of Scott Andrews/Canon