CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, External Tank-138 is being transported to the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4056

CAPE CANAVERAL, Fla. -- Tugboats safely deliver NASA's Pegasus barge, carrying External Tank-138 to the turn basin at NASA's Kennedy Space Center in Florida. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jack Pfaller

KSC-2010-4080

CAPE CANAVERAL, Fla. -- Viewed from across the turn basin in the Launch Complex 39 area at NASA's Kennedy Space Center in Florida, External Tank-138 is being offloaded from the Pegasus barge near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4065

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, workers prepare External Tank-138 for offload from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jack Pfaller

KSC-2010-4077

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, preparations are under way to offload External Tank-138 from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4084

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, the massive open door of the Vehicle Assembly Building welcomes External Tank-138.The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4081

CAPE CANAVERAL, Fla. -- Viewed from inside the Pegasus barge docked in the turn basin at NASA's Kennedy Space Center in Florida, workers accompany the newly offloaded External Tank-138. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4064

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, preparations are under way to offload External Tank-138 from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jack Pfaller

KSC-2010-4079

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, External Tank-138 is being offloaded from the Pegasus barge docked in the turn basin. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4085

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, the massive open door of the Vehicle Assembly Building welcomes External Tank-138. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4087

CAPE CANAVERAL, Fla. -- Viewed from inside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, External Tank-138 is being towed toward the massive door of the building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4086

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, External Tank-138 approaches the massive door of the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4082

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, workers accompany the newly offloaded External Tank-138 from the Pegasus barge docked in the turn basin. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

KSC-2010-4088

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, External Tank-138 is being towed through the massive doors into the transfer aisle of the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. -- External Tank-138 is lifted high above the transfer aisle in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, prior to its move to a test cell where it will be checked before launch. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Dimitri Gerondidakis

KSC-2010-4114

CAPE CANAVERAL, Fla. -- In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, External Tank-138 is lifted above the transfer aisle. The external fuel tank is being moved into a test cell where it will be checked out before launch. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Dimitri Gerondidakis

KSC-2010-4122

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, External Tank-138 has been lifted into the upper levels of a high bay in the Vehicle Assembly Building. It will then be lowered onto a test stand and checked before launch. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Dimitri Gerondidakis

KSC-2010-4115

CAPE CANAVERAL, Fla. -- A close-up view of External Tank-138 being lifted above the transfer aisle in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The external fuel tank is being moved into a test cell where it will be checked out before launch. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Dimitri Gerondidakis

KSC-2011-3036

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers monitor the progress of external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is lifted from its test cell for transfer to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3052

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers monitor the progress of external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is positioned between the twin solid rocket boosters on the mobile launcher platform in high bay-1. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3042

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is lowered into high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3046

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers monitor the progress of external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is lowered into high bay-1 between the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3053

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is positioned between the twin solid rocket boosters on the mobile launcher platform in high bay-1. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3049

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is being lowered between the twin solid rocket boosters on the mobile launcher platform in high bay-1. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3045

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers monitor the progress of external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is lowered into high bay-1 between the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3047

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers guide external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is lowered into high bay-1 between the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3044

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is lowered into high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3040

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is transferred to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3048

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers guide external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is lowered into high bay-1 between the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3035

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank for space shuttle Atlantis' STS-135 mission, ET-138, is prepared for transfer from its test cell to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3034

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank for space shuttle Atlantis' STS-135 mission, ET-138, is prepared for transfer from its test cell to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3050

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, workers monitor the progress of external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, as it is lowered into high bay-1 between the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3041

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is lowered into high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3038

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is lifted from its test cell for transfer to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3039

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is transferred to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3051

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is positioned between the twin solid rocket boosters on the mobile launcher platform in high bay-1. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3043

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is lowered into high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-3037

CAPE CANAVERAL, Fla. - In the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida, external fuel tank, ET-138, for space shuttle Atlantis' STS-135 mission, is lifted from its test cell for transfer to high bay-1 for joining with the twin solid rocket boosters on the mobile launcher platform. Shuttle Atlantis' move, or "rollover," from Orbiter Processing Facility-1 to the VAB is targeted for May 10. Once there it will be mated with the external tank and boosters. Atlantis and its crew of four will deliver the Raffaello multipurpose logistics module packed with supplies 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/Jack Pfaller

KSC-2011-4575

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. Here, a technician prepares an image plate inside the outertank. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4576

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4573

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians prepare to conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4577

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4574

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians prepare to conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. Here, a technician prepares an image plate inside the outertank. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4581

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4580

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann

KSC-2011-4579

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, technicians conduct Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on the shuttle-facing side of Atlantis' external tank at Launch Pad 39A. The hi-tech images will be taken of the tops and bottoms of the 21-foot long beams, which are located on the tank's intertank section. The scans follow a June 15th tanking test when the launch team filled then drained the tank of about 535,000 gallons of liquid hydrogen and liquid oxygen, just like for a launch. Earlier this year, managers directed teams to make the same stringer modifications to Atlantis' tank, ET-138, as they had after small cracks in the support beams of shuttle Discovery's STS-133 mission external tank were discovered. The scans will confirm there are no issues with Atlantis' tank. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. 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: NASA/Jim Grossmann