Expedition 64 backup crew member, NASA astronaut Mark Vande Hei, is seen at the conclusion of a press conference, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anne McClain of NASA, is seen during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member NASA astronaut Kate Rubins, is seen during Soyuz qualification exams Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of her scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Oleg Artemyev of Roscosmos signs in for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 43 Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), waves out a window to fellow crew mates, NASA Astronaut Scott Kelly, and, Russian Cosmonaut Gennady Padalka of Roscosmos, as they prepare to depart the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia for Baikonur, Kazakhstan, Saturday, March 14, 2015, Star City, Russia. The trio is preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 backup crew member, NASA astronaut Jack Fisher, dons his Sokol suit ahead of his Soyuz qualification exams with Russian cosmonaut Fyodor Yurchikhin, and ESA astronaut Paolo Nespoli, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

The prime and backup crew members for Expedition 28 to the International Space Station pose for pictures on the grounds of the Gagarin Cosmonaut Training Center, from left to right are NASA astronaut and backup flight engineer Don Pettit, Russian cosmonaut and backup Soyuz commander Oleg Kononenko, European Space Agency astronaut and backup flight engineer Andre Kuipers, NASA astronaut and prime crew flight engineer Mike Fossum, Russian cosmonaut and prime Soyuz commander Sergei Volkov, Japan Aerospace astronaut and prime crew flight engineer Satoshi Furukawa. The crew later departed for Baikonur, Kazakhstan in preparation for their June launch onboard a Soyuz rocket. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 backup crew members NASA astronaut Mark Vande Hei, arrives for Soyuz qualification exams Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 49 NASA astronaut Shane Kimbrough dons his Russian Sokol suit ahead of the Soyuz qualification exams with Russian cosmonaut Sergei Ryzhikov and Russian cosmonaut Andrey Borisenko of Roscosmos, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member, Anne McClain of NASA is seen during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station.Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 42 Cosmonaut Alexander Samokutyaev of the Russian Federal Space Agency (Roscosmos), center, who returned to Earth from the International Space Station two days earlier, is seen as he comes to say farewell to Expedition 43 crew members; NASA Astronaut Scott Kelly, Russian Cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) at the the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia Saturday, March 14, 2015. The Expedition 43 trio is preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet are seen ahead of their Soyuz qualification exams, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet pose for a group photograph at the conclusion of a press conference, Wednesday, Oct. 26, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Russian Sokol suit gloves are seen as Expedition 49 NASA astronaut Shane Kimbrough, and Russian cosmonauta Sergei Ryzhikov of Roscosmos and Andrey Borisenko of Roscosmos don their Russian Sokol suits ahead of their Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 prime crew member Sergey Ryzhikov of Roscosmos, speaks during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member NASA astronaut Mark Vande Hei is seen during Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Director of the Gagarin Cosmonaut Training Center (GCTC), Pavel Vlasov, is seen during Expedition 65 Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Launch of the mission is scheduled for April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 52 flight engineer Paolo Nespoli of ESA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member NASA astronaut Anne McClain signs in for Soyuz qualification exams while Russian cosmonaut Oleg Artemyev of Roscosmos looks on, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Oleg Novitskiy of Roscosmos, is seen during Soyuz qualification exams Saturday, March 20, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, seated left, and Randy Bresnik of NASA are seen as they sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

From left to right, Expedition 65 backup crew members NASA astronaut Anne McClain, Russian cosmonaut Oleg Artemyev of Roscosmos, Russian cosmonaut Anton Shkaplerov of Roscosmos, and Expedition 65 prime crew members, Russian cosmonaut Oleg Novitskiy of Roscosmos, Russian cosmonaut Pyotr Dubrov of Roscosmos and NASA astronaut Mark Vande Hei, are seen during a press conference prior to the prime team’s launch from Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 49 NASA astronaut Shane Kimbrough, left, Russian cosmonaut Sergei Ryzhikov of Roscosmos, center, and Russian cosmonaut Andrey Borisenko of Roscosmos pose for a group photograph outside the Soyuz simulator ahead of their Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineers Sergey Ryazanskiy of Roscosmos, seated left, and Randy Bresnik of NASA are seen as they sign a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/Bill Ingalls)

Expedition 52 flight engineer Randy Bresnik of NASA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC) as Expedition 52 flight engineers Paolo Nespoli of ESA, left, and Sergey Ryazanskiy of Roscosmos look on, Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member NASA astronaut Anne McClain waves during a press conference prior to the prime crew’s launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anton Shkaplerov of Roscosmos, is seen during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 NASA flight engineer Joe Acaba signs for his Soyuz vehicle simulation test card before senior officials at the Gagarin Cosmonaut Training Center, Tuesday, April 24, 2012 in Star City, Russia, while his fellow crew members Soyuz Commander Gennady Padalka, left, and flight engineer Sergei Revin look on. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 64 prime crew member NASA astronaut Kate Rubins signs a guest book at the "Memorial working study of Yuri Gagarin" at the Gagarin Cosmonaut Training Center (GCTC), as her crew mates watch, Thursday, Sept. 24, 2020 in Star City, Russia. The memorial study represents Gagarin's working study in the way it was abandoned by Gagarin on March 27, 1968 before leaving for the airfield for training flight that became his last. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 43 NASA Astronaut Scott Kelly, left, and Russian Cosmonauts Mikhail Kornienko, center, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) walk with family and friends as they depart the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for Baikonur, Kazakhstan, Saturday, March 14, 2015. The trio are preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 prime crew member Sergey Kud-Sverchkov of Roscosmos, waves during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 29 Commander Mike Fossum, left, Russian cosmonaut Sergei Volkov and Japanese Aerospace Exploration Agency astronaut Satoshi Furukawa, third from left, take part in a traditional welcome home ceremony at the Gagarin Cosmonaut Training Center in Star City, Russia on Thursday, Dec. 15, 2011. The crew landed on the steppes of Kazakhstan on November 22nd after spending five months living and working aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 backup crew members Kevin Ford, Oleg Novitskiy and Evgeny Tarelkin salute senior officials before their final qualification test in preparation for flight, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Expedition 31 prime crew members commander Gennady Padalka, flight engineers Joe Acaba and Sergei Revin practiced similar scenarios nearby in advance of their final approval for launch to the International Space Station, scheduled for May 15, 2012. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 prime crew member NASA astronaut Mark Vande Hei, speaks during a press conference prior to his launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew member Petr Dubrov of Roscosmos speaks to Mark Vande Hei of NASA during a press conference, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 crew members ESA astronaut Thomas Pesquet, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Peggy Whitson report to mission managers for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 crew member Sergey Ryzhikov of Roscosmos, signs in for Soyuz qualification exams as fellow crew member Sergey Kud-Sverchkov of Roscosmos looks on, Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos pose for a photo during Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 49 crew members: NASA astronaut Shane Kimbrough, left, Russian cosmonaut Sergei Ryzhikov of Roscosmos, center, and Russian cosmonaut Andrey Borisenko of Roscosmos don their Russian Sokol Suits ahead of their Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

From left to right, Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, Russian cosmonaut Pyotr Dubrov of Roscosmos, Russian cosmonaut Oleg Novitskiy of Roscosmos, and Expedition 65 backup crew members Russian cosmonaut Anton Shkaplerov of Roscosmos, Russian cosmonaut Oleg Artemyev of Roscosmos, and NASA astronaut Anne McClain, are seen during a press conference prior to the prime team’s launch from Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member Sergey Ryzhikov of Roscosmos arrives for Soyuz qualification exams Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member NASA astronaut Kate Rubins, arrives for Soyuz qualification exams Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of her scheduled launch October 14 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

From left to right, Expedition 64 prime crew members, NASA astronaut Kate Rubins, Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos, and Russian cosmonaut Sergey Ryzhikov of Roscosmos, and Expedition 64 backup crew members Russian cosmonaut Oleg Novitskiy of Roscosmos, Russian cosmonaut Petr Dubrov of Roscosmos, and NASA astronaut Mark Vande Hei, greet media at a press conference prior to their scheduled launch from the Baikonur Cosmodrome in Kazakhstan, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member Sergey Ryzhikov of Roscosmos signs in for his Soyuz qualification exams as crew mates Kate Rubins of NASA, left, and Sergey Kud-Sverchkov of Roscosmos, right, look on, Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 31 NASA backup crew member Kevin Ford, left, Oleg Novitskiy and Evgeny Tarelkin, third from left, select International Space Station Russian segment event simulation test cards for their final qualification test in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Photo Credit: (NASA/Carla Cioffi)

A Soyuz TMA spacecraft mockup is seen at the Gagarin Cosmonaut Training Center, Monday, April 23, 2012 in Star City, Russia. Expedition 31 prime and backup crew members train in the Soyuz mockup in preparation for final flight to the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member Russian cosmonaut Oleg Artemyev speaks during a press conference prior to the prime crew’s launch from the Baikonur Cosmodrome in Kazakhstan, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos, pose for a photo after a press conference prior to their launch from the Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

The Soyuz simulator control room is seen as Expedition 49 NASA astronaut Shane Kimbrough, Russian cosmonauts Sergei Ryzhikov and Andrey Borisenko of Roscosmos participate in their Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 prime crew member, Russian cosmonaut Oleg Novitskiy of Roscosmos, waves goodbye during an official farewell ceremony prior to his departure to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 backup crew member Mark Vande Hei of NASA signs in for his Soyuz qualification exams as crew mates Oleg Novitskiy of Roscosmos, left, and Petr Dubrov of Roscosmos look on, Wednesday, Sept. 23, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 64 prime crew members, Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos, left, Russian cosmonaut Sergey Ryzhikov of Roscosmos, center, and NASA astronaut Kate Rubins, pose for a photo after a press conference, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 52 flight engineers Paolo Nespoli of ESA, left, Sergey Ryazanskiy of Roscosmos, center, and Expedition 52 flight engineer Randy Bresnik of NASA pose for group photograph at the conclusion of their crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 64 backup crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Petr Dubrov of Roscosmos pose for a photo during qualification exams Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 64 crew member Russian cosmonaut Sergey Kud-Sverchkov of Roscosmos signs in for Soyuz qualification exams as NASA astronaut Kate Rubins, left, and Russian cosmonaut Sergey Ryzhikov of Roscosmos, center, look on, Tuesday, Sept. 22, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Irina Spector)

Sergei Krikalev, Director of the Gagarin Cosmonaut Training Center, answers a reporter's question, Monday, April 23, 2012 in Star City, Russia. Krikalev is joined by Oleg Kotov, Deputy Director, GCTC. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 prime crew members, Russian cosmonauts Pyotr Dubrov of Roscosmos, left, and Oleg Novitskiy of Roscosmos, wave goodbye after boarding the bus to their flight to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet laugh together as they prepare for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 crew members ESA astronaut Thomas Pesquet, Russian cosmonaut Oleg Novitskiy of Roscosmos, and NASA astronaut Peggy Whitson conduct their final qualification exams inside a Soyuz simulator, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly, gives a thumbs up as he boards a bus to depart the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for his flight to Baikonur, Kazakhstan, with fellow crew members, Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos), Saturday, March 14, 2015. The trio are preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew member Oleg Novitskiy of Roscosmos, is seen during Soyuz qualification exams Saturday, March 20, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anton Shkaplerov of Roscosmos signs in for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Irina Spector)

Expedition 50 ESA astronaut Thomas Pesquet is seen inside the Soyuz simulator during final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Pesquet, Russian cosmonaut Oleg Novitskiy of Roscosmos, and NASA astronaut Peggy Whitson are scheduled to launch in November 2016. Photo Credit: (NASA/Bill Ingalls)

From left to right, Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, Russian cosmonaut Pyotr Dubrov of Roscosmos, and Russian cosmonaut Oleg Novitskiy of Roscosmos, are seen during a press conference prior to their launch from Baikonur Cosmodrome, Wednesday, March 24, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 NASA flight engineer Joe Acaba, Soyuz Commander Gennady Padalka and flight engineer Sergei Revin pose for photos before their final qualification test in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 crew member Pyotr Dubrov of Roscosmos, signs in for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 backup crew members, ESA astronaut Paolo Nespoli, left, Russian cosmonaut Fyodor Yurchikhin of Roscosmos, center, and NASA astronaut Jack Fisher don their Sokol suits ahead of their Soyuz qualification exams, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member NASA astronaut Anne McClain signs in for Soyuz qualification exams while Russian cosmonaut Anton Shkaplerov of Roscosmos, left, and Russian cosmonaut Oleg Artemyev of Roscosmos look on, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Pyotr Dubrov of Roscosmos, signs in for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

From left to right, Expedition 65 backup crew members, Russian cosmonaut Oleg Artemyev of Roscosmos, Russian cosmonaut Anton Shkaplerov of Roscosmos, and NASA astronaut Anne McClain, pose for a photo with Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, Russian cosmonaut Oleg Novitskiy of Roscosmos, and Russian cosmonaut Pyotr Dubrov of Roscosmos, during an official farewell ceremony prior to their departure to Baikonur for the prime crew’s launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 50 crew members ESA astronaut Thomas Pesquet, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Peggy Whitson answer reporter's questions ahead of their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 crew members ESA astronaut Thomas Pesquet, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Peggy Whitson answer reporter's questions ahead of their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

201503040001hq (03/04/2015) --- NASA Astronaut Scott Kelly is seen inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC), Wednesday, Mar. 4, 2105 in Star City, Russia. Kelly, along with Expedition 43 Russian cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), and Russian cosmonaut Gennady Padalka of Roscosmos were at GCTC for the second day of qualification exams in preparation for their launch to the International Space Station onboard a Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 31 backup crew members Kevin Ford (left), Oleg Novitskiy and Evgeny Tarelkin (right) give the thumbs up before their final qualification test in preparation for flight, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Expedition 31 prime crew members commander Gennady Padalka, flight engineers Joe Acaba and Sergei Revin practiced similar scenarios nearby in advance of their final approval for launch to the International Space Station, scheduled for May 15, 2012. Photo Credit: (NASA/Carla Cioffi)

Expedition 50 NASA astronaut Peggy Whitson answers a reporter's question as Russian cosmonaut Oleg Novitskiy of Roscosmos looks on, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Whitman, Novitskiy and ESA astronaut Thomas Pesquet performed their final qualification exams right after talking to the press. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet prepare for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

The Expedition 43 Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos), talks with friends and family as he waits for fellow crew mates, NASA Astronaut Scott Kelly, and, Russian Cosmonaut Mikhail Kornienko of Roscosmos, ahead of their departure from the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia for Baikonur, Kazakhstan, Saturday, March 14, 2015. The trio is preparing for launch to the International Space Station in their Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/Bill Ingalls)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet meet with mission managers ahead of their Soyuz qualification exams, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 49 Russian cosmonaut Andrey Borisenko of Roscosmos is seen during the Soyuz qualification exams, Wednesday, Aug. 31, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 prime crew member, NASA astronaut Mark Vande Hei, waves goodbye after boarding the bus to his flight to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 NASA flight engineer Joe Acaba, left, Soyuz Commander Gennady Padalka and flight engineer Sergei Revin, third from left, stand at attention before senior officials for their final qualification test in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 65 backup crew members NASA astronaut Anne McClain, left, Russian cosmonaut Anton Shkaplerov of Roscosmos, center, and Russian cosmonaut Oleg Artemyev of Roscosmos arrive for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Friends and family join in for a photo with Expedition 65 backup crew members, Russian cosmonaut Oleg Artemyev of Roscosmos, second from left, Russian cosmonaut Anton Shkaplerov of Roscosmos, third from left, NASA astronaut Anne McClain, fourth from left, and Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, fifth from left, Russian cosmonaut Oleg Novitskiy of Roscosmos, fourth from right, and Russian cosmonaut Pyotr Dubrov of Roscosmos, third from right, during an official farewell ceremony prior to their departure to Baikonur for the prime crew’s launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

International Space Station mockup training modules are seen at the Gagarin Cosmonaut Training Center, Monday, April 23, 2012 in Star City, Russia. Expedition 31 prime and backup crew members train in these moduls in preparation for final flight to the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 64 backup crew member Petr Dubrov of Roscosmos is seen during a press conference, Thursday, Sept. 24, 2020 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 prime crew member, Russian cosmonaut Pyotr Dubrov of Roscosmos, boards the bus that will take him to his flight to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 NASA NASA Flight Engineer Joe Acaba signs for his International Space Station Russian segment event simulation test card before senior officials at the Gagarin Cosmonaut Training Center, Monday, April 23, 2012 in Star City, Russia, while his fellow crew members Soyuz commander Gennady Padalka (left) and Sergei Revin look on. Acaba, Padalka and Revin are set to launch May 15 from the Baikonur Cosmodrome in their Soyuz TMA-04M spacecraft to the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 50 ESA astronaut Thomas Pesquet dons his Sokol suit ahead of his final qualification exams with fellow crew mates NASA astronaut Peggy Whitson and Russian cosmonaut Oleg Novitskiy of Roscosmos, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 backup crew member, Anne McClain of NASA signs in for Soyuz qualification exams Monday, March 22, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (GCTC/Andrey Shelepin)

Expedition 50 crew members NASA astronaut Peggy Whitson, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and ESA astronaut Thomas Pesquet report to mission managers for their final qualification exams, Tuesday, Oct. 25, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and Russian cosmonaut Pyotr Dubrov of Roscosmos meet with mission managers ahead of their Soyuz qualification exams, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 52 flight engineer Randy Bresnik of NASA answers a reporter's question during a crew press conference at the Gagarin Cosmonaut Training Center (GCTC), Monday, July 10, 2017 in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

Expedition 65 crew members Russian cosmonaut Pyotr Dubrov of Roscosmos, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, center, and NASA astronaut Mark Vande Hei, pose for a photo during qualification exams, Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of their scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 prime crew members, NASA astronaut Mark Vande Hei, left, Russian cosmonaut Oleg Novitskiy of Roscosmos, second from left, and Russian cosmonaut Pyotr Dubrov of Roscosmos, second from right, are seen walking with friends and family during an official farewell ceremony prior to their departure to Baikonur for launch from the Baikonur Cosmodrome, Friday, March 26, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 backup crew member, Anton Shkaplerov of Roscosmos signs in for Soyuz qualification exams Saturday, March 20, 2021 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of the Expedition 65 launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 65 crew member Mark Vande Hei of NASA, signs in for Soyuz qualification exams Monday, March 22, 2021, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, in advance of his scheduled launch April 9 from Baikonur Cosmodrome in Kazakhstan to the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)