NASA's fourth space-rated space shuttle, OV-104 Atlantis, made its final planned move from Orbiter Processing Facility-1 to the Vehicle Assembly Building at Kennedy Space Center in Florida.

The move, called rollover, is a major milestone in processing for the STS-135 mission to the International Space Station, targeted for early July. Inside the Vehicle Assembly Building, the shuttle will be attached to its external fuel tank and solid rocket boosters.

During the STS-135 mission, space shuttle Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station.

The mission also will fly a system to investigate the potential for robotically refueling existing spacecraft and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems.

The space shuttle is to fly the 12-day mission that includes a spacewalk by the International Space Station crew. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the International Space Station, and the 135th and final mission of NASA's Space Shuttle Program since STS-1.

The crew members, who were at the final rollover for the planned STS-135 mission are: Commander Christopher Ferguson, Pilot Douglas Hurley and Mission Specialists Sandra Magnus and Rex Walheim.

All STS-135 crew members have been custom fitted for a Russian Sokol pressure suit and molded Soyuz seat liner should they be forced to return to Earth via Soyuz capsule in the event that the shuttle is unable make the reentry and land.

Take a glimpse of the space shuttle Atlantis final rollover: