CAPE CANAVERAL, Fla. - Walter "Buddy" McKenzie shakes hands with STS-134 Pilot Gregory H. Johnson as Mission Specialist Michael Fincke, right, looks on. The astronauts visited with employees inside NASA Kennedy Space Center's Orbiter Processing Facility-1, where space shuttle Endeavour is being prepared for public display. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-134 Pilot Gregory H. Johnson is joined by several employees as he signs a poster inside Orbiter Processing Facility-1 at NASA's Kennedy Space Center in Florida. Also attending the crew return event was STS-134 Mission Specialist Michael Fincke. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-134 Mission Specialist Michael Fincke, foreground, and Pilot Gregory H. Johnson are joined by Walter "Buddy" McKenzie as the astronauts get a close look at space shuttle Endeavour inside NASA Kennedy Space Center's Orbiter Processing Facility-1. The spacecraft is being prepared for public display. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Walter "Buddy" McKenzie leads STS-134 Pilot Gregory H. Johnson, foreground, Mission Specialist Michael Fincke, space shuttle Endeavour Flow Director Dana Hutcherson and others through Orbiter Processing Facility-1 following a crew return event. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-134 Mission Specialist Michael Fincke, left, and Pilot Gregory H. Johnson pose in front of space shuttle Endeavour's landing gear inside NASA Kennedy Space Center's Orbiter Processing Facility-1 following a crew return event. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-134 Pilot Gregory H. Johnson, left, and Mission Specialist Michael Fincke talk to employees inside NASA Kennedy Space Center's Orbiter Processing Facility-1, where space shuttle Endeavour is being prepared for public display. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - STS-134 Mission Specialist Michael Fincke sits in the commander's seat on space shuttle Endeavour's flight deck. He is joined by STS-134 Pilot Gregory H. Johnson, settled in the pilot's seat. The astronauts visited with employees and got an up-close look at Endeavour inside NASA Kennedy Space Center's Orbiter Processing Facility-1, where the spacecraft is being prepared for public display. Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett