It will be joined with the external fuel tank and solid rocket boosters on the mobile launcher platform.

In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, shuttle Atlantis' systems are being "powered-up," or tested in preparation of its move to the Vehicle Assembly Building where it will be joined with the external fuel tank and solid rocket boosters on the mobile launcher platform. Atlantis is being prepared for the STS-135 mission, which will deliver the Raffaello multipurpose logistics module packed with supplies, logistics and spare parts to the International Space Station. STS-135 is targeted to launch June 28, and will be the last spaceflight for the Space Shuttle Program. Photo credit: NASA/Jim Grossmann