The orbiter Atlantis is ready to roll out of the Orbiter Processing Facility to make the short trip to the Vehicle Assembly Building.

The orbiter Atlantis is ready to roll out of the Orbiter Processing Facility to make the short trip to the Vehicle Assembly Building. First motion was at 6:19 a.m. EST. Once in the VAB, Atlantis will be lifted into high bay 1 and mated with the external tank and solid rocket boosters already in place on the mobile launcher platform. The rollover signals the start of the journey to the launch pad for liftoff on mission STS-117 targeted for March 15. The mission is the 21st to the International Space Station and will deliver the S3/S4 starboard truss segments. Photo credit: NASA/Kim Shiflett