ISS028-E-005623 (27 May 2011) --- A fish-eye lens attached to an electronic still camera was used to capture this image of NASA astronaut Michael Fincke (center frame) during the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom (top left) and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm.

JSC2010-E-060738 (29 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center. NASA astronaut Andrew Feustel, mission specialist, assisted Chamitoff.

JSC2010-E-060727 (29 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center. NASA astronaut Andrew Feustel, mission specialist, assisted Chamitoff.

JSC2010-E-060730 (29 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

JSC2010-E-060735 (29 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

JSC2010-E-060734 (29 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

JSC2010-E-060732 (29 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

STS-134 Commander Mark Kelly, center, along with his crew pose for a photograph following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

STS-134 Commander Mark Kelly, center, along with his crew speaks to the media following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

STS-134 Commander Mark Kelly, center, along with his crew speaks to the media following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

STS-134 crew members, Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori wave following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

ISS028-E-005630 (27 May 2011) --- A fish-eye lens attached to an electronic still camera was used to capture this image of NASA astronaut Michael Fincke (top center) during the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm. The docked space shuttle Endeavour is visible at left. The blackness of space and Earth?s horizon provide the backdrop for the scene.

ISS028-E-005627 (27 May 2011) --- A fish-eye lens attached to an electronic still camera was used to capture this image of NASA astronaut Michael Fincke (bottom center) during the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm. The docked space shuttle Endeavour is visible at bottom left.

ISS028-E-005634 (27 May 2011) --- A fish-eye lens attached to an electronic still camera was used to capture this image of NASA astronaut Michael Fincke (top center) during the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm. The docked space shuttle Endeavour is visible at left. The blackness of space and Earth?s horizon provide the backdrop for the scene.

JSC2010-E-185492 (12 Nov. 2010) --- NASA astronauts Michael Fincke (seated left) and Andrew Feustel, both STS-134 mission specialists, wearing liquid cooling and ventilation garments that complement the Extravehicular Mobility Unit (EMU) spacesuits, participate in a training session in the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center. NASA astronaut Greg Chamitoff, mission specialist, is visible in the background. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-014287 (27 Jan. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, prepares for the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Astronaut Mark Kelly, commander, assisted Chamitoff.

JSC2010-E-014278 (27 Jan. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets help in the donning of a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Astronaut Mark Kelly, commander, assisted Chamitoff.

JSC2011-E-029127 (25 March 2011) --- NASA astronauts Michael Fincke and Greg Chamitoff (partially obscured), both STS-134 mission specialists, attired in training versions of their Extravehicular Mobility Unit (EMU) spacesuits, are submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Divers (out of frame) are in the water to assist Fincke and Chamitoff in their rehearsal, which is intended to help prepare them for work on the exterior of the International Space Station. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-029126 (25 March 2011) --- NASA astronauts Michael Fincke and Greg Chamitoff (partially obscured), both STS-134 mission specialists, attired in training versions of their Extravehicular Mobility Unit (EMU) spacesuits, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Divers are in the water to assist the Fincke and Chamitoff in their rehearsal, which intended to help prepare them for work on the exterior of the International Space Station. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-014281 (27 Jan. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets help in the donning of a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Astronaut Mark Kelly, commander, assisted Chamitoff.

JSC2011-E-029104 (25 March 2011) --- NASA astronauts Mark Kelly (right), STS-134 commander; and Greg Chamitoff, mission specialist, are pictured in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center. Chamitoff, wearing a training version of his Extravehicular Mobility Unit (EMU) spacesuit, is preparing for a spacewalk training session in the waters of the NBL. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-014761 (28 Jan. 2010) --- NASA astronauts Greg Chamitoff (left), Andrew Feustel and Michael Fincke, all STS-134 mission specialists, participate in an EVA tile repair training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

JSC2010-E-014291 (27 Jan. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2010-E-014762 (28 Jan. 2010) --- NASA astronauts Greg Chamitoff (left), Andrew Feustel and Michael Fincke, all STS-134 mission specialists, participate in an EVA tile repair training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

President Barack Obama and First Lady Michelle Obama meet with STS-134 space shuttle Endeavor commander Mark Kelly, right, and shuttle astronauts, from left, Andrew Feustel, European Space Agency’s Roberto Vittori, Michael Fincke, Gregory H. Johnson, and Greg Chamitoff, after their launch was scrubbed, Friday, April 29, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Photo Credit: (NASA/Bill Ingalls)

President Barack Obama and First Lady Michelle Obama meet with STS-134 space shuttle Endeavor commander Mark Kelly, right, and shuttle astronauts, from left, Andrew Feustel, European Space Agency’s Roberto Vittori, Michael Fincke, Gregory H. Johnson, and Greg Chamitoff, after their launch was scrubbed, Friday, April 29, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Photo Credit: (NASA/Bill Ingalls)

JSC2011-E-029110 (25 March 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets help donning a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-014763 (28 Jan. 2010) --- NASA astronauts Greg Chamitoff (left), Andrew Feustel and Michael Fincke, all STS-134 mission specialists, participate in an EVA tile repair training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Instructor John Ray (right) assisted the crew members.

JSC2010-E-014772 (28 Jan. 2010) --- NASA astronauts Greg Chamitoff (left), Andrew Feustel and Michael Fincke, all STS-134 mission specialists, participate in an EVA tile repair training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Instructor John Ray (right) assisted the crew members.

JSC2011-E-029115 (25 March 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-029098 (25 March 2011) --- NASA astronauts Michael Fincke (left) and Greg Chamitoff (right), both STS-134 mission specialists, wearing liquid cooling and ventilation garments that complement the Extravehicular Mobility Unit (EMU) spacesuits, participate in a training session in the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

ISS017-E-017130 (20 Sept. 2008) --- Astronaut Greg Chamitoff, Expedition 17 flight engineer, works on an experiment in the Unity node of the International Space Station.

ISS017-E-019007 (13 Oct. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, floats in the Destiny laboratory of the International Space Station.

S134-E-010935 (30 May 2011) --- NASA astronauts Greg H. Johnson (left), STS-134 pilot; Michael Fincke (center) and Greg Chamitoff, both mission specialists, are busy on the aft flight deck of space shuttle Endeavour during undocking and fly-around operations with the International Space Station on flight day 15. Chamitoff is using a handheld laser ranging device -- designed to measure the range between two spacecraft -- through one of the overhead windows. Photo credit: NASA

S134-E-010934 (30 May 2011) --- NASA astronauts Greg H. Johnson (left), STS-134 pilot; Michael Fincke (center) and Greg Chamitoff, both mission specialists, are busy on the aft flight deck of space shuttle Endeavour during undocking and fly-around operations with the International Space Station on flight day 15. Chamitoff is using a handheld laser ranging device -- designed to measure the range between two spacecraft -- through one of the overhead windows. Photo credit: NASA

S134-E-010933 (30 May 2011) --- NASA astronauts Greg H. Johnson (left), STS-134 pilot; Michael Fincke (center) and Greg Chamitoff, both mission specialists, are busy on the aft flight deck of space shuttle Endeavour during undocking and fly-around operations with the International Space Station on flight day 15. Chamitoff is using a handheld laser ranging device -- designed to measure the range between two spacecraft -- through one of the overhead windows. Photo credit: NASA

ISS017-E-011556 (20 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, trims Russian Federal Space Agency cosmonaut Sergei Volkov's hair in the Harmony node of the International Space Station. Chamitoff used hair clippers fashioned with a vacuum device to garner freshly cut hair.

JSC2011-E-028160 (23 March 2011) --- NASA astronauts Greg H. Johnson (right), STS-134 pilot; and Greg Chamitoff, mission specialist, are pictured during an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

The STS-134 astronauts from left, European Space Agency's Roberto Vittori, Gregory H. Johnson, pilot; Mark Kelly, commander; Michael Fincke, Greg Chamitoff, and Andrew Feustel all mission specialists, pose for a group photograph shortly after landing onboard the space shuttle Endeavour at the Shuttle Landing Facility (SLF) at Kennedy Space Center, Wednesday, June 1, 2011, in Cape Canaveral, Fla. Endeavour, completing a 16-day mission to outfit the International Space Station, spent 299 days in space and traveled more than 122.8 million miles during its 25 flights. It launched on its first mission on May 7, 1992. Photo Credit: (NASA/Bill Ingalls)

ISS017-E-012258 (16 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, looks over a checklist in the Destiny laboratory of the International Space Station.

ISS017-E-017302 (27 Sept. 2008) --- Astronaut Greg Chamitoff, Expedition 17 flight engineer, works with the Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) in the Destiny laboratory of the International Space Station.

ISS017-E-017118 (20 Sept. 2008) --- Astronaut Greg Chamitoff, Expedition 17 flight engineer, looks over procedures checklists in the Unity node of the International Space Station.

ISS017-E-011574 (19 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, smiles for a photo near a chess board in the Harmony node of the International Space Station.

ISS017-E-011577 (19 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, ponders his next move as he plays a game of chess in the Harmony node of the International Space Station.

ISS017-E-021977 (23 Oct. 2008) --- Astronaut Greg Chamitoff, Expedition 18 flight engineer, uses a still camera at a window in the Zvezda Service Module of the International Space Station.

ISS017-E-012548 (28 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, prepares to eat a meal near the galley in the Zvezda Service Module of the International Space Station.

ISS017-E-021366 (23 Oct. 2008) --- Astronaut Greg Chamitoff (left), Expedition 18 flight engineer, and American spaceflight participant Richard Garriott pose for a photo in the Destiny laboratory of the International Space Station.

ISS017-E-012001 (30 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, uses a computer while working with an experiment in the Kibo laboratory of the International Space Station.

ISS017-E-021970 (23 Oct. 2008) --- Astronaut Greg Chamitoff, Expedition 18 flight engineer, takes a moment for a photo while working with camera equipment in the Destiny laboratory of the International Space Station.

ISS017-E-012105 (1 Aug. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with the Treadmill Vibration Isolation System (TVIS) in the Zvezda Service Module of the International Space Station.

ISS017-E-011982 (30 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with an experiment in the Kibo laboratory of the International Space Station.

ISS017-E-021288 (15 Oct. 2008) --- Astronaut Greg Chamitoff, Expedition 17/18 flight engineer, works with the hydrogen (H2) sensor in the Destiny laboratory of the International Space Station.

ISS017-E-018994 (12 Oct. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, takes a moment for a photo while working in the Columbus laboratory of the International Space Station.

ISS017-E-019017 (13 Oct. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, poses for a photo while floating in the Destiny laboratory of the International Space Station.

S124-E-005147 (1 June 2008) --- Astronaut Greg Chamitoff, STS-124 mission specialist, looks over a checklist on the middeck of Space Shuttle Discovery during flight day two activities.

ISS017-E-019013 (13 Oct. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, poses for a photo while floating in the Destiny laboratory of the International Space Station.

ISS017-E-012257 (16 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, looks over a checklist in the Destiny laboratory of the International Space Station.

S124-E-005687 (2 June 2008) --- Astronaut Greg Chamitoff, STS-124 mission specialist, uses a still camera at a window on the aft flight deck of Space Shuttle Discovery during flight day three activities.

ISS017-E-013970 (22 Aug. 2008) --- Astronaut Greg Chamitoff, Expedition 17 flight engineer, conducts a function checkout for the Japanese Experiment Module's Remote Manipulator System in the Kibo laboratory on the International Space Station.

ISS018-E-006428 (2 Nov. 2008) --- Astronaut Greg Chamitoff, Expedition 18 flight engineer, wears a communication system headset while looking through a window in the Kibo laboratory of the International Space Station.

ISS017-E-011917 (30 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with an experiment in the Columbus laboratory of the International Space Station.

ISS017-E-012864 (12 Aug. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, performs in-flight maintenance on the Treadmill Vibration Isolation System (TVIS) in the Zvezda Service Module of the International Space Station.

ISS017-E-012047 (30 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with an experiment in the Kibo laboratory of the International Space Station.

ISS017-E-011973 (30 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with an experiment in the Kibo laboratory of the International Space Station.

ISS018-E-006455 (30 Oct. 2008) --- Astronaut Greg Chamitoff, Expedition 18 flight engineer, installs a Geoflow experiment container in the Columbus laboratory of the International Space Station.

ISS017-E-014001 (23 Aug. 2008) --- Astronaut Greg Chamitoff, Expedition 17 flight engineer, works with the Microgravity Sciences Glovebox and the Commercial Generic Bioprocessing Apparatus in the Columbus laboratory on the International Space Station.

ISS017-E-011910 (30 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with an experiment in the Columbus laboratory of the International Space Station.

ISS017-E-013312 (15 Aug. 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works at the Japanese Remote Manipulator System (JEM-RMS) work station in the Kibo laboratory of the International Space Station.

JSC2010-E-124263 (8 Sept. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a training session in the fixed-base shuttle mission simulator (SMS) in the Jake Garn Simulation and Training Facility at NASA?s Johnson Space Center. United Space Alliance suit technician Daniel Palmer assisted Chamitoff. Photo credit: NASA or National Aeronautics and Space Administration

ISS018-E-007817 (5 Nov. 2008) --- Astronauts Michael Fincke (foreground) and Greg Chamitoff, Expedition 18 commander and flight engineer, respectively, work the controls of the Canadarm2 robotic work station in the Destiny laboratory of the International Space Station. Fincke and Chamitoff grappled the External Stowage Platform-3 on the P3 truss and relocated it to a capture attachment mechanism on the Mobile Base System.

ISS027-E-034394 (20 May 2011) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, NASA astronaut Greg Chamitoff, STS-134 mission specialist, exits the International Space Station?s Quest airlock to begin the first session of extravehicular activity (EVA) for the STS-134 mission. Astronaut Andrew Feustel (out of frame), mission specialist, joined Chamitoff on the spacewalk.

JSC2008-E-038909 (6 May 2008) --- Astronaut Greg Chamitoff, STS-124 mission specialist, takes a moment for a photo near a NASA T-38 trainer jet prior to a flight from Ellington Field near NASA's Johnson Space Center to Kennedy Space Center, Florida. Chamitoff is scheduled to join Expedition 17 as flight engineer after launching to the International Space Station on mission STS-124.

JSC2010-E-124282 (8 Sept. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his shuttle launch and entry suit, prepares for a training session in the fixed-base shuttle mission simulator (SMS) in the Jake Garn Simulation and Training Facility at NASA?s Johnson Space Center. United Space Alliance suit technician Daniel Palmer assisted Chamitoff. Photo credit: NASA or National Aeronautics and Space Administration

S124-E-007955 (9 June 2008) --- NASA astronauts Garrett Reisman, STS-124 mission specialist, and Greg Chamitoff, Expedition 17 flight engineer, pose for a portrait following a joint news conference with the STS-124 crewmembers from the Kibo Japanese Pressurized Module of the International Space Station while Space Shuttle Discovery is docked with the station. Reisman, who joined the station's crew in March, is being replaced by Chamitoff, who arrived at the station with the STS-124 crew.

JSC2011-E-026938 (11 March 2011) --- Attired in training versions of their shuttle launch and entry suits, NASA astronaut Greg Chamitoff (foreground) and Andrew Feustel, both STS-134 mission specialists, participate in an ingress/egress training session in a shuttle mock-up in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Suit technician Raymond Cuevas assisted Chamitoff and Feustel. Photo credit: NASA or National Aeronautics and Space Administration

ISS027-E-034379 (20 May 2011) --- NASA astronauts Andrew Feustel (left) and Greg Chamitoff (right), both STS-134 mission specialists, attired in Extravehicular Mobility Unit (EMU) spacesuits, are pictured in the Quest airlock of the International Space Station as they prepare for the start of the mission's first spacewalk. NASA astronauts Mark Kelly (center right), commander, and Michael Fincke, mission specialist, assisted Feustel and Chamitoff.

JSC2010-E-025726 (23 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. United Space Alliance suit technician Toni Cost-Davis assisted Chamitoff. Astronaut Michael Fincke, mission specialist, is visible at right background.

ISS017-E-014091 (26 Aug. 2008) --- Thanks to the weightlessness of space, astronaut Greg Chamitoff, Expedition 17 flight engineer, isn't toting the excessive weight load he appears to be in this electronic still photo downlinked by the current inhabitants of the International Space Station. While cosmonaut Sergei Volkov, Expedition 17 commander, looks on, Chamitoff works in the Kibo laboratory to move an experiment rack during a relocation task he and the two Russian crewmembers were sharing.

ISS027-E-034386 (20 May 2011) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, NASA astronaut Greg Chamitoff, STS-134 mission specialist, prepares to exit the International Space Station?s Quest airlock to begin the first session of extravehicular activity (EVA) for the STS-134 mission. Astronaut Andrew Feustel (out of frame), mission specialist, joined Chamitoff on the spacewalk.

JSC2008-E-038919 (6 May 2008) --- Astronaut Greg Chamitoff, STS-124 mission specialist, photographed in the rear station of a NASA T-38 trainer jet, prepares for a flight from Ellington Field near NASA's Johnson Space Center to Kennedy Space Center, Florida. Chamitoff is scheduled to join Expedition 17 as flight engineer after launching to the International Space Station on mission STS-124.

S134-E-006436 (17 May 20110) --- NASA astronauts Greg Chamitoff (left), mission specialist, and Mark Kelly, mission commander, work on separate chores on Endeavour's middeck during the second flight day of the STS-134 mission. Chamitoff is holding Cube Lab Module ? 8. Kelly is unpacking canisters of the Group Activation Pack. Endeavour and its crew of six astronauts will arrive at the International Space Station in less than 24 hours. Photo credit: NASA

ISS028-E-005938 (27 May 2011) --- NASA astronauts Greg Chamitoff (left) and Michael Fincke (right), both STS-134 mission specialists, attired in Extravehicular Mobility Unit (EMU) spacesuits, prepare for the start of the mission?s fourth session of extravehicular activity (EVA) in the Quest airlock of the International Space Station. NASA astronauts Mark Kelly (center right), STS-134 commander; and Ron Garan, Expedition 28 flight engineer, assisted Chamitoff and Fincke.

S134-E-009126 (25 May 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, supports the mission?s third session of extravehicular activity from inside the aft flight deck of space shuttle Endeavour while docked with the International Space Station. Chamitoff choreographed the spacewalkers activities and coordinated communications between the spacewalkers and Mission Control Center in Houston. Photo credit: NASA

ISS027-E-034395 (20 May 2011) --- Attired in his Extravehicular Mobility Unit (EMU) spacesuit, NASA astronaut Greg Chamitoff, STS-134 mission specialist, exits the International Space Station?s Quest airlock to begin the first session of extravehicular activity (EVA) for the STS-134 mission. Astronaut Andrew Feustel (out of frame), mission specialist, joined Chamitoff on the spacewalk.

JSC2011-E-026929 (11 March 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for an ingress/egress training session in a shuttle mock-up in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Suit technician Daniel Palmer assisted Chamitoff. Photo credit: NASA or National Aeronautics and Space Administration

ISS028-E-005662 (27 May 2011) --- A fish-eye lens attached to an electronic still camera was used to capture this image of NASA astronaut Greg Chamitoff during the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Chamitoff and astronaut Michael Fincke (visible in the reflections of Chamitoff?s helmet visor), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm.

JSC2011-E-028161 (23 March 2011) --- NASA astronauts Greg Chamitoff (foreground), STS-134 mission specialist; and Greg H. Johnson, pilot, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

ISS027-E-034873 (19 May 2011) --- Inside Japan Aerospace Exploration Agency's Kibo lab onboard the International Space Station, five members of Endeavour's STS-134 crew respond to questions from the news media. From left to right are NASA astronauts Greg Chamitoff and Michael Fincke, European Space Agency astronaut Roberto Vittori and NASA astronaut Andrew Feustel, all mission specialists, and NASA astronaut Greg H. Johnson, pilot. Not pictured is NASA astronaut Scott Kelly, mission commander.

JSC2011-E-028163 (23 March 2011) --- NASA astronauts Greg Chamitoff (foreground), STS-134 mission specialist; and Greg H. Johnson, pilot, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

ISS028-E-005620 (26 May 2011) ---- Three members of the STS-134 crew assigned to space shuttle Endeavour?s final mission are pictured in the Japan Aerospace Exploration Agency?s Kibo lab on the International Space Station, where they joined with three other crew members (out of frame) for a crew portrait. Left to right are European Space Agency astronaut Roberto Vittori and NASA astronauts Greg H. Johnson and Greg Chamitoff. Johnson is the mission's pilot and the other two are mission specialists.

JSC2011-E-028157 (23 March 2011) --- NASA astronaut Greg H. Johnson (left), STS-134 pilot; along with European Space Agency astronaut Roberto Vittori (second left) and NASA astronauts Andrew Feustel and Greg Chamitoff (seated), all mission specialists, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

S134-E-010911 (30 May 2011) --- STS-134 crew members are busy on the aft flight deck of space shuttle Endeavour during undocking and fly-around operations with the International Space Station on flight day 15. Pictured are NASA astronauts Mark Kelly (right), commander; and Greg H. Johnson (left), pilot; along with European Space Agency astronaut Roberto Vittori (second left), NASA astronauts Andrew Feustel (bottom) and Greg Chamitoff, all mission specialists. Photo credit: NASA

JSC2011-E-024812 (8 March 2011) --- STS-134 crew members pose for a photo during a cake-cutting ceremony in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Pictured from the left are European Space Agency astronaut Roberto Vittori, NASA astronauts Andrew Feustel, Michael Fincke, all mission specialists; Greg H. Johnson, pilot; Mark Kelly, commander; and Greg Chamitoff, mission specialist. Photo credit: NASA or National Aeronautics and Space Administration

ISS027-E-035296(20 May 2011) --- NASA astronaut Andrew Feustel, mission specialist, ingresses the airlock hatch on the International Space Station (ISS) at the completion of the STS-134 mission's first of four space walks. Astronauts Feustel and Greg Chamitoff (out of frame), fellow mission specialist, accomplished several tasks on the ISS.

S126-E-008603 (20 Nov. 2008) --- Astronauts Greg Chamitoff, STS-126 mission specialist, and Sandra Magnus, Expedition 18 flight engineer, work in the Kibo laboratory of the International Space Station while Space Shuttle Endeavour remains docked with the station.

JSC2011-E-050734 (2 June 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, is pictured during the STS-134 crew return ceremony on June 2, 2011 at Ellington Field near NASA's Johnson Space Center. Photo credit: NASA

ISS028-E-006013 (28 May 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, performs maintenance on the Carbon Dioxide Removal Assembly in the Kibo laboratory of the International Space Station while space shuttle Endeavour remains docked with the station.

ISS017-E-012283 (31 July 2008) --- NASA astronaut Greg Chamitoff, Expedition 17 flight engineer, works with the Shear History Extensional Rheology Experiment (SHERE) rheometer inside the Microgravity Science Glovebox (MSG) in the Columbus laboratory of the International Space Station.

S124-E-005672 (2 June 2008) --- Astronaut Greg Chamitoff, STS-124 mission specialist, looks over a checklist on the middeck of Space Shuttle Discovery during flight day three activities. Two Extravehicular Mobility Unit (EMU) spacesuits are visible in the background.

S124-E-007654 (7 June 2008) --- Astronaut Greg Chamitoff, Expedition 17 flight engineer, takes a moment for a photo as he works in the Destiny laboratory of the International Space Station while Space Shuttle Discovery is docked with the station.