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)

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 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)

NASA astronaut Greg Johnson, at podium, speaks at a ceremony where senior NASA officials presented the National Federation of the Blind with two Louis Braille Bicentennial Silver Dollars that flew on Space Shuttle Atlantis' mission (STS-125) to the Hubble Space Telescope in May 2009, Friday evening, July 31, 2009, at the Capitol Visitors Center in Washington. Photo Credit: (NASA/Paul E. Alers)

NASA astronaut Greg Johnson, left, speaks with Dr. Marc Mauer, president of the National Federation of the Blind, right, prior to a ceremony where senior NASA officials presented the NFB with two Louis Braille Bicentennial Silver Dollars that flew on Space Shuttle Atlantis' mission (STS-125) to the Hubble Space Telescope in May 2009, Friday evening, July 31, 2009, at the Capitol Visitors Center in Washington. Photo Credit: (NASA/Paul E. Alers)

Greg “Box” Johnson, executive director of Center for the Advancement of Science in Space (CASIS) and former astronaut, foreground, and NASA Acting Chief Technologist Douglas Terrier watch as attendees of the Boy Scouts of America National Jamboree launch a weather balloon, Tuesday, July 25, 2017 at the Summit Bechtel Reserve in Glen Jean, West Virginia. Photo Credit: (NASA/Bill Ingalls)

Astronauts from the STS-125 mission to repair the Hubble Space Telescope shared accounts of their mission today at StenniSphere. The crewmembers-Commander Scott Altman, Pilot Greg Johnson and Mission Specialists Megan McArthur, Michael Good, Drew Feustel and Mike Massimino-thanked Stennis employees for their contributions to the success of the mission and presented a plaque to Marina Benigno, director of center operations. Pictured are (l to r) Massimino, Good, Feustel, Altman, McArthur and Johnson.

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-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

JSC2011-E-017044 (27 July 2010) --- NASA astronaut Gregory H. Johnson, pilot. Photo credit: NASA or National Aeronautics and Space Administration [alternate portrait]

JSC2011-E-017046 (27 July 2010) --- NASA astronaut Gregory H. Johnson, pilot. Photo credit: NASA or National Aeronautics and Space Administration [alternate portrait]

JSC2011-E-017047 (27 July 2010) --- NASA astronaut Gregory H. Johnson, pilot. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-017045 (27 July 2010) --- NASA astronaut Gregory H. Johnson, pilot. Photo credit: NASA or National Aeronautics and Space Administration [alternate portrait]

JSC2011-E-017048 (27 July 2010) --- NASA astronaut Gregory H. Johnson, pilot. Photo credit: NASA or National Aeronautics and Space Administration [alternate portrait]

Lori Garver, NASA Deputy Administrator, second from left, stands with members of the STS-125 crew and IMAX officials including Producer/Director Toni Myers, fifth from right, prior to the World Premiere of "Hubble 3D", screened at the Smithsonian's Air and Space Museum Tuesday evening, March 9, 2010, in Washington. Members of the STS-125 crew, dressed in their blue flight suits from left are; Mike Massimino, John Grunsfeld, Megan McArthur, Greg Johnson and Scott Altman. Photo Credit: (NASA/Paul E. Alers)

jsc2024e022817 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022825 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

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

jsc2024e022824 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022820 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022809 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022819 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022823 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022818 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

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

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

jsc2024e022812 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022822 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022828 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

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.

jsc2024e022806 March 26, 2024 -- Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022805 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022821 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022815 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

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

jsc2024e022811 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022826 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022827 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022816 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

jsc2024e022829 March 26, 2024 -- NASA’s Johnson Space Center in Houston hosted a Tuesday, March 26, visit by Texas Governor Greg Abbott, who visited NASA’s Mission Control Center, spoke with native Texan and NASA astronaut Loral O'Hara aboard the International Space Station, and introduced the new members of the Texas Space Commission. Abbott was joined by NASA Johnson Space Center Director Vanessa Wyche, Texas House Speaker Dade Phelan, Texas Representative Greg Bonnen and other state and space industry leaders.

JSC2011-E-028158 (23 March 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, participates 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

JSC2011-E-028488 (24 March 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, responds to a question from a reporter during a preflight press conference at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-050735 (2 June 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, 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

Pilot Greg Johnson and Mission Specialist Mike Fincke of Space Shuttle Endeavour's final mission STS-134 come to Ames Research Center to share their experiences, answer questions and sign autographs during a afternoon with the staff. Astronauts Johnson and Fincke present photo to Ames Associate Director Steve Zornetzer.

Pilot Greg Johnson and Mission Specialist Mike Fincke of Space Shuttle Endeavour's final mission STS-134 come to Ames Research Center to share their experiences, answer questions and sign autographs during a afternoon with the staff.

ISS028-E-005913 (27 May 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, enjoys a meal on the middeck of space shuttle Endeavour while docked with the International Space Station.

Pilot Greg Johnson and Mission Specialist Mike Fincke of Space Shuttle Endeavour's final mission STS-134 come to Ames Research Center to share their experiences, answer questions and sign autographs during a afternoon with the staff.

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)

JSC2011-E-050763 (2 June 2011) --- NASA's Johnson Space Center (JSC) director Michael L. Coats (left) and STS-134 crew members are pictured during the STS-134 crew return ceremony on June 2, 2011 at Ellington Field near JSC. Pictured from second left are NASA astronauts Mark Kelly, commander; Greg H. Johnson, pilot; Michael Fincke, European Space Agency?s Roberto Vittori, NASA astronauts Andrew Feustel and Greg Chamitoff, all mission specialists. Photo credit: NASA

JSC2011-E-050737 (2 June 2011) --- NASA's Johnson Space Center (JSC) director Michael L. Coats (left) and STS-134 crew members are pictured during the STS-134 crew return ceremony on June 2, 2011 at Ellington Field near JSC. Pictured from second left are NASA astronauts Mark Kelly, commander; Greg H. Johnson, pilot; Michael Fincke, European Space Agency?s Roberto Vittori, NASA astronauts Andrew Feustel and Greg Chamitoff, all mission specialists. Photo credit: NASA

JSC2011-E-050741 (2 June 2011) --- NASA's Johnson Space Center (JSC) director Michael L. Coats (left) and STS-134 crew members are pictured during the STS-134 crew return ceremony on June 2, 2011 at Ellington Field near JSC. Pictured from second left are NASA astronauts Mark Kelly, commander; Greg H. Johnson, pilot; Michael Fincke, European Space Agency?s Roberto Vittori, NASA astronauts Andrew Feustel and Greg Chamitoff, all mission specialists. Photo credit: NASA

JSC2011-E-024816 (8 March 2011) --- NASA astronaut Mark Kelly, STS-134 commander, speaks to a crowd during a cake-cutting ceremony in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Also pictured in the background (from the left) are NASA astronaut Greg H. Johnson, pilot; NASA astronaut Michael Fincke, European Space Agency astronaut Roberto Vittori, NASA astronauts Andrew Feustel and Greg Chamitoff, all mission specialists. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-028489 (24 March 2011) --- The STS-134 crew members along with Public Affairs Office moderator Nicole Cloutier (left) are pictured during a preflight press conference at NASA's Johnson Space Center. From the second left are NASA astronauts Mark Kelly, commander; Greg H. Johnson, pilot; and Michael Fincke, European Space Agency?s Roberto Vittori, and NASA astronauts Andrew Feustel and Greg Chamitoff, all mission specialists. News media representatives are visible in the foreground. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-028501 (24 March 2011) --- The STS-134 crew members along with Public Affairs Office moderator Nicole Cloutier (left) are pictured during a preflight press conference at NASA's Johnson Space Center. From the second left are NASA astronauts Mark Kelly, commander; Greg H. Johnson, pilot; and Michael Fincke, European Space Agency?s Roberto Vittori, and NASA astronauts Andrew Feustel and Greg Chamitoff, all mission specialists. News media representatives are visible in the foreground. 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

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

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.

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-009323 (20 May 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, floats through a hatch on the International Space Station while space shuttle Endeavour remains docked with the station. Photo credit: NASA

ISS027-E-035420 (21 May 2011) --- NASA astronaut Mark Kelly, Expedition 27 commander, looks at the various mission insignias placed in the Unity node of the International Space Station before placing the STS-134 insignia among them. NASA astronaut Greg H. Johnson, pilot, is pictured as well.

JSC2010-E-025722 (23 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets helps with the donning of 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.

ISS028-E-005912 (27 May 2011) --- NASA astronauts Greg H. Johnson (top), STS-134 pilot; and Andrew Feustel, mission specialist, share a meal with their shuttle and station crewmates on the middeck of space shuttle Endeavour while docked with the International Space Station.

S134-E-005571 (16 May 2011) --- Astronaut Greg Johnson, STS-134 pilot, still in his orange launch and entry suit not long after the launch phase was complete, gets to work at the pilot's station on the space shuttle Endeavour's flight deck. Photo credit: NASA

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-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.

S134-E-006857 (18 May 2011) --- NASA astronauts Mark Kelly (left), STS-134 commander; and Greg H. Johnson, pilot, occupy their respective stations on the forward flight deck of space shuttle Endeavour during rendezvous and docking operations with the International Space Station on flight day three. Photo credit: NASA

JSC2010-E-024596 (11 Feb. 2010) --- Attired in a training version of his shuttle launch and entry suit, NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in a training session on the middeck of the crew compartment trainer (CCT-2) in the Space Vehicle Mockup Facility at NASA's Johnson Space Center.

JSC2010-E-051958 (12 April 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a post insertion/de-orbit training session in the Space Vehicle Mock-up Facility 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-024606 (11 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his shuttle launch and entry suit, awaits the start of a training session in the crew compartment trainer (CCT-2) in the Space Vehicle Mockup Facility at NASA's Johnson Space Center.

JSC2010-E-025724 (23 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets helps with the donning of 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.

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-025725 (23 Feb. 2010) --- Attired in training versions of their shuttle launch and entry suits, NASA astronauts Greg Chamitoff (left) and Michael Fincke, both STS-134 mission specialists, participate in a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

Pilot Greg Johnson and Mission Specialist Mike Fincke of Space Shuttle Endeavour's final mission STS-134 come to Ames Research Center to share their experiences, answer questions and sign autographs during a afternoon with the staff. With John W. 'Jack' Boyd on right.

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-018547 (3 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his shuttle launch and entry suit, is pictured during a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

S134-E-011280 (28 May 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, is pictured on the middeck of space shuttle Endeavour while docked with the International Space Station during flight day 13. Photo credit: NASA

JSC2011-E-050711 (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

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.

S134-E-006882 (18 May 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, occupies his station on the forward flight deck of space shuttle Endeavour during rendezvous and docking operations with the International Space Station on flight day three. Photo credit: NASA

S134-E-010959 (30 May 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, is pictured near an overhead window on the aft flight deck of space shuttle Endeavour after undocking with the International Space Station (visible through the window) on flight day 15. Photo credit: NASA

JSC2010-E-018566 (3 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, attired in a training version of his shuttle launch and entry suit, participates in a training session on the flight deck of the Full Fuselage Trainer (FFT) in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

JSC2011-E-028492 (24 March 2011) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, fields a question from a reporter during a preflight press conference at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

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

JSC2010-E-132395 (16 July 2010) --- NASA astronauts Andrew Feustel (foreground) and Greg Chamitoff, both STS-134 mission specialists, are pictured during an emergency scenarios training session in the Space Vehicle Mockup Facility at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

S134-E-005574 (16 May 2011) --- Astronaut Greg Johnson, STS-134 pilot, still in his orange launch and entry suit not long after the launch phase was complete, gets to work at the pilot's station on the space shuttle Endeavour's flight deck. Photo credit: NASA

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.

JSC2010-E-018590 (3 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets help with the donning of a training version of his shuttle launch and entry suit in preparation for a training session in the Space Vehicle Mock-up Facility at NASA?s Johnson Space Center.

JSC2010-E-025732 (23 Feb. 2010) --- Attired in a training version of his shuttle launch and entry suit, NASA astronaut Greg Chamitoff, STS-134 mission specialist, participates in a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2011-E-029130 (25 March 2011) --- NASA astronaut Greg H. Johnson (foreground), STS-134 pilot, participates 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

JSC2011-E-050705 (2 June 2011) --- NASA astronauts Mark Kelly (left), STS-134 commander; Greg H. Johnson, pilot; and Michael Fincke, mission specialist, are pictured during the STS-134 crew return ceremony on June 2, 2011 at Ellington Field near NASA's Johnson Space Center. Photo credit: NASA

JSC2010-E-087708 (25 May 2010) --- NASA astronaut Gregory H. Johnson (foreground), STS-134 pilot; along with astronauts Greg Chamitoff and Michael Fincke, both STS-134 mission specialists, participate in a food tasting session in the Habitability and Environmental Factors Office at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-119534 (25 Aug. 2010) --- NASA astronaut Gregory H. Johnson (second left), STS-134 pilot; along with NASA astronauts Greg Chamitoff (left), Andrew Feustel and European Space Agency astronaut Roberto Vittori, all mission specialists, are pictured in the check-out facility at Ellington Field near NASA's Johnson Space Center prior to a familiarization flight in NASA T-38 trainer jets. Photo credit: NASA or National Aeronautics and Space Administration

JSC2011-E-024817 (8 March 2011) --- NASA astronaut Mark Kelly, STS-134 commander, speaks to a crowd during a cake-cutting ceremony in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Also pictured in the background is NASA astronaut Greg H. Johnson, pilot. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-132399 (16 July 2010) --- NASA astronauts Greg Chamitoff (left), STS-134 mission specialist; and Gregory H. Johnson, pilot, pose for a photo during an emergency scenarios training session in the Space Vehicle Mockup Facility at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

JOHNSON SPACE CENTER, Houston, Texas - STS134-S-002 --- Attired in training versions of their shuttle launch-and-entry suits, these six astronauts take a break from training to pose for the STS-134 crew portrait. Pictured clockwise are NASA astronauts Mark Kelly (bottom center), commander; Gregory H. Johnson, pilot; Michael Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency's Roberto Vittori, all mission specialists.

JSC2009-E-284891 (15 Dec. 2009) --- STS-134 crew members participate in an EVA Thermal Protection System (TPS) overview training session in the TPS/ Precision Air Bearing Facility in the Space Vehicle Mock-up Facility at NASA?s Johnson Space Center. Pictured from the right are NASA astronauts Andrew Feustel, Greg Chamitoff, Michael Fincke, all mission specialists; along with NASA astronaut Gregory H. Johnson, pilot; and European Space Agency astronaut Roberto Vittori, mission specialist.