STS-135 Commander Chris Ferguson, right, talks with NASA Administrator Charles Bolden atop of the Mobile Launch Platform (MLP) as the space shuttle Atlantis (STS-135) rolls out of High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis is seen through the window of a Shuttle Training Aircraft (STA) as it launches from launch pad 39A at Kennedy Space Center on the STS-135 mission, Friday, July 8, 2011 in Cape Canaveral, Fla. Atlantis launched on the final flight of the shuttle program on a 12-day mission to the International Space Station. The STS-135 crew will deliver the Raffaello multipurpose logistics module containing supplies and spare parts for the space station. Photo Credit: (NASA/Dick Clark)

Space shuttle Atlantis is seen through the window of a Shuttle Training Aircraft (STA) as it launches from launch pad 39A at Kennedy Space Center on the STS-135 mission, Friday, July 8, 2011 in Cape Canaveral, Fla. Atlantis launched on the final flight of the shuttle program on a 12-day mission to the International Space Station. The STS-135 crew will deliver the Raffaello multipurpose logistics module containing supplies and spare parts for the space station. Photo Credit: (NASA/Dick Clark)

Space shuttle Atlantis, STS-135, launches skyward on a 12-day mission to the International Space Station (ISS), Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis is the final flight of the shuttle program and will carry the Raffaello multipurpose logistics module containing supplies and spare parts for the space station. Photo Credit: (NASA/Paul E. Alers)

Space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden talks with other NASA management atop of the Mobile Launcher Platform (MLP) just prior to rollout of the Space Shuttle Atlantis (STS-135) from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

Close up view of the side the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel are photographed under the wing of the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work under the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel work on the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

The runway of the Shuttle Landing Facility (SLF) is marked to show where the main landing gear wheels stopped for the space shuttle Atlantis (STS-135) shortly after it landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden looks at the space shuttle Atlantis atop of the Mobile Launch Platform (MLP) just prior to rollout of Atlantis (STS-135) from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

NASA Astronaut and STS-135 Commander Chris Ferguson walks underneath the space shuttle Atlantis shortly after he and the rest of the STS-135 crew landed at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing a 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

STS-135 Mission Specialist Rex Walheim walks under the space shuttle Atlantis shortly after he and the rest of the STS-135 crew landed at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing a 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

STS-135 Commander Chris Ferguson talks to NASA Television and the news media in front of the space shuttle Atlantis shortly after he and the rest of the STS-135 crew landed at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing a 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Astronaut and STS-135 Commander Chris Ferguson walks underneath the space shuttle Atlantis shortly after he and the rest of the STS-135 crew landed at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing a 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden looks at the space shuttle Atlantis atop of the Mobile Launch Platform (MLP) just prior to rollout of Atlantis (STS-135) from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is revealed as the rotating service structure (RSS) is rolled back at launch pad 39a on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Guests look on from the terrace of Operations Support Building II as space shuttle Atlantis launches from launch pad 39A on the STS-135 mission Friday, July 8, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Atlantis and its crew will deliver to the International Space Station the Raffaello multipurpose logistics module containing supplies and spare parts for the space station. Photo Credit: (NASA/Carla Cioffi)

NASA and contractor personnel work to secure the tow bar onto the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. The runway is marked to show where the nose landing gear wheels stopped. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA and contractor personnel mount American flags to support vehicles near the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. The runway is marked to show where the nose landing gear wheels stopped. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

STS-135 crew members Chris Ferguson, left, Douglas Hurley, second from left, Sandra Magnus, and Rex Walheim, right, pose for a group photograph atop of the Mobile Launch Platform (MLP) as the space shuttle Atlantis (STS-135) rolls out of High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop a Mobile Launcher Platform (MLP) just prior to beginning its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop the Mobile Launch Platform (MLP) during its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop the Mobile Launch Platform (MLP) during its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop the Mobile Launch Platform (MLP) as it begins its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop the Mobile Launch Platform (MLP) as it begins its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop the Mobile Launch Platform (MLP) as it begins its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop the Mobile Launch Platform (MLP) during its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop a Mobile Launcher Platform (MLP) just prior to beginning its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

Space Shuttle Atlantis (STS-135) is seen atop a Mobile Launcher Platform (MLP) just prior to beginning its journey from High Bay 3 in the Vehicle Assembly Building to Launch Pad 39a for its final flight, Tuesday evening, May 31, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The 3.4-mile trek, known as "rollout," will take about seven hours to complete. Atlantis will carry the Raffaello multipurpose logistics module to deliver supplies, logistics and spare parts to the International Space Station. The launch of STS-135 is targeted for July 8. Photo Credit: (NASA/Bill Ingalls)

NASA Chief of the Astronaut Office Peggy Whitson, left, STS-135 mission Pilot Doug Hurley, second from left, NASA Administrator Charles Bolden, and Deputy Chief of Flight Crew Operations Directorate Brian Kelly, right, talk under the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Hurley and the rest of the STS-135 crew landed in Atlantis early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

The vertical tail of the space shuttle Atlantis is seen at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Kennedy Space center Director Robert Cabana sings an STS-135 landing car placard at the Shuttle Landing Facility (SLF) runway at NASA Kennedy Space Center shortly after the space shuttle Atlantis (STS-135) landed, completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Launch Director Michael Leinbach, right, hands an American flag to a worker on the runway of the Shuttle Landing Facility (SLF) shortly after the space shuttle Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

The exhaust plume from space shuttle Atlantis is seen as it launches from pad 39A on Friday, July 8, 2011, at NASA's Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA management look on from Firing Room Four of the Launch Control Center (LCC) as space shuttle Atlantis launches from pad 39A on Friday, July 8, 2011, in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden and Deputy Administrator Lori Garver walk under the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Kennedy Space center Director Robert Cabana stops to have his photograph made by a colleague at the Shuttle Landing Facility (SLF) shortly after the space shuttle Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

A view looking forward underneath the space shuttle Atlantis on the Shuttle Landing Facility (SLF) runway at NASA Kennedy Space Center shortly after it landed with the STS-135 crew, completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA International Space Station Program Office Manager Michael Suffredini, left, NASA Administrator Charles Bolden, second from left, Deputy Administrator Lori Garver, Manager, Space Shuttle Program Office John Shannon, third from left, and an unidentified colleague, talk under the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Atlantis (STS-135) landed early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

STS-135 Commander Chris Ferguson, right, talks to the media as NASA Administrator Charles Bolden, left, STS-135 Mission Specialists Rex Walheim, second from left, Sandy Magnus, third from left, and Pilot Doug Hurley look on shortly after the crew touched down in space shuttle Atlantis at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis (STS-135) is rolled over to the Orbiter Processing Facility (OPF) shortly after landing at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis (STS-135) is rolled over to the Orbiter Processing Facility (OPF) shortly after landing at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

Space shuttle Atlantis (STS-135) is rolled over to the Orbiter Processing Facility (OPF) shortly after landing at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Kennedy Space center Director Robert Cabana talks with members of the shuttle tile team which are wearing flowered shirts together at the Shuttle Landing Facility (SLF) runway at NASA Kennedy Space Center shortly after the space shuttle Atlantis (STS-135) landed, completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden, right, and NASA Kennedy Space center Director Robert Cabana pose for a photograph together at the Shuttle Landing Facility (SLF) runway at NASA Kennedy Space Center shortly after the space shuttle Atlantis (STS-135) landed, completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden, left, and NASA Kennedy Space center Director Robert Cabana walk along the Shuttle Landing Facility (SLF) runway at NASA Kennedy Space Center shortly after the space shuttle Atlantis (STS-135) landed, completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden, left, and NASA Kennedy Space center Director Robert Cabana walk along the Shuttle Landing Facility (SLF) runway at NASA Kennedy Space Center as members of teh media prepare to ask them questions shortly after the space shuttle Atlantis (STS-135) landed, completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

NASA Kennedy Space Center Director Bob Cabana, right, and Commander Chris Ferguson talk underneath the space shuttle Atlantis shortly after Ferguson and the rest of the STS-135 crew landed at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing a 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

The STS-135 astronauts, from left, Mission Specialists Rex Walheim, Sandy Magnus, Pilot Doug Hurley and Commander Chris Ferguson all pose for photographers shortly after they touched down in the space shuttle Atlantis at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

The STS-135 astronauts, from left, Mission Specialists Rex Walheim, Sandy Magnus, Pilot Doug Hurley and Commander Chris Ferguson all pose for photographers shortly after they touched down in the space shuttle Atlantis at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing its 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, technicians install an elbow camera onto the robotic arm inside shuttle Atlantis' payload bay. 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

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, an elbow camera has been installed onto the robotic arm inside shuttle Atlantis' payload bay. 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

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, the clamshell doors of space shuttle Atlantis' payload bay are closing in preparation for the its move to the Vehicle Assembly Building next month. 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/Jack Pfaller

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, technicians prepare an elbow camera for installation onto a robotic arm inside shuttle Atlantis' payload bay. 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

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, technicians install an elbow camera onto the robotic arm inside shuttle Atlantis' payload bay. 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

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida, a technician checks the connection of an elbow camera installed onto the robotic arm inside shuttle Atlantis' payload bay. 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

CAPE CANAVERAL, Fla. -- On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-135 Commander Chris Ferguson and Mission Specialist Sandy Magnus are signaled to a stop on the tarmac. The STS-135 astronauts arrived at Kennedy about 2:30 p.m. EDT on July 4 for final preparations for space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis is scheduled to lift off on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the 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/Kim Shiflett

CAPE CANAVERAL, Fla. -- On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-135 Commander Chris Ferguson prepares to disembark from a T-38 jet. The STS-135 astronauts arrived at Kennedy about 2:30 p.m. EDT on July 4 for final preparations for space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis is scheduled to lift off on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the 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/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Mission Specialist Rex Walheim, holding an American flag to commemorate the U.S. Independence Day holiday, speaks to media at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. The STS-135 astronauts arrived at Kennedy about 2:30 p.m. EDT on July 4 for final preparations for space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis is scheduled to lift off on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the 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/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Mission Specialist Sandy Magnus have touched down in a T-38 jet on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, closely followed by Pilot Doug Hurley and Mission Specialist Rex Walheim. The STS-135 astronauts arrived at Kennedy about 2:30 p.m. EDT on July 4 for final preparations for space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis is scheduled to lift off on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the 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

CAPE CANAVERAL, Fla. -- On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-135 Mission Specialist Rex Walheim is greeted by Shuttle Launch Director Mike Leinbach. The STS-135 crew members arrived at Kennedy at about 2:30 p.m. EDT on July 4 for final preparations for space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis is scheduled to lift off on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the 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/Kim Shiflett

CAPE CANAVERAL, Fla. -- On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-135 Pilot Doug Hurley and Mission Specialist Rex Walheim are ready to disembark from a T-38 jet. The STS-135 astronauts arrived at Kennedy about 2:30 p.m. EDT on July 4 for final preparations for space shuttle Atlantis' STS-135 mission to the International Space Station. Atlantis is scheduled to lift off on July 8 to deliver the Raffaello multi-purpose logistics module packed with supplies and spare parts to the 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/Kim Shiflett