NASA ASTRONAUT CHRIS CASSIDY, ,SIGNS A PLAQUE TO BE MOUNTED IN THE PAYLOAD OPERATIONS INTEGRATION CENTER AT THE MARSHALL SPACE FLIGHT CENTER.

NASA ASTRONAUT CHRIS CASSIDY, , CHATS WITH MEMBERS OF THE HUNTSVILLE-AREA NEWS MEDIA DURING HIS JAN. 22 VISIT TO THE MARSHALL SPACE FLIGHT CENTER

NASA ASTRONAUT CHRIS CASSIDY, , CHATS WITH MEMBERS OF THE HUNTSVILLE-AREA NEWS MEDIA DURING HIS JAN. 22 VISIT TO THE MARSHALL SPACE FLIGHT CENTER

ASTRONAUT CHRIS CASSIDY, WHO LIVED AND WORKED FIVE MONTHS AS AN EXPEDITION 36 FLIGHT ENGINEER ABOARD THE INTERNATIONAL SPACE STATION, ADDRESSES MSFC EMPLOYEES AND HIGH SCHOOL STUDENTS FOR MISSION HIGHLIGHTS PROGRAM ON 1/22/14

NASA ASTRONAUT CHRIS CASSIDY, A FLIGHT ENGINEER DURING INTERNATIONAL SPACE STATION EXPEDITION 36, TALKS ON-STAGE IN MORRIS AUDITORIUM DURING HIS JAN. 22 VISIT TO THE MARSHALL SPACE FLIGHT CENTER.

NASA ASTRONAUT CHRIS CASSIDY TALKS LIVE WITH CURRENT ISS CREW MEMBERS DURING A VISIT TO THE PAYLOAD OPERATIONS INTEGRATION CENTER, OR THE POIC, AS PART OF A MARSHALL SPACE FLIGHT CENTER VISIT JAN. 22.

STS-127 astronauts Chris Cassidy and Tom Marshburn during STS-127 2J/INC-19 EVA 4 training at the NBL Location: SCTF, NBL

NASA ASTRONAUT CHRIS CASSIDY, A FLIGHT ENGINEER FOR INTERNATIONAL SPACE STATION EXPEDITION 36, VISITED THE MARSHALL SPACE FLIGHT CENTER JAN. 22 TO THANK MARSHALL TEAM MEMBERS FOR THEIR SUPPORT OF NASA’S ONGOING MISSION IN SPACE; TO HANG A MISSION PLAQUE IN THE PAYLOAD OPERATIONS INTEGRATION CENTER; AND TO GREET WORKERS, SIGN AUTOGRAPHS AND TALK ABOUT HIS EXPERIENCES DURING HIS FIVE AND A HALF MONTHS ON ORBIT.

NASA ASTRONAUT CHRIS CASSIDY, LEFT, A FLIGHT ENGINEER FOR INTERNATIONAL SPACE STATION EXPEDITION 36, RECEIVES A COMMEMORATIVE PLAQUE FROM TERESA VANHOOSER, DEPUTY DIRECTOR OF THE MARSHALL SPACE FLIGHT CENTER, DURING HIS JAN. 22 VISIT TO MARSHALL.

iss063e053998 (July 21, 2020) --- NASA spacewalkers (from left) Bob Behnken and Chris Cassidy give a thumbs up during a spacewalk to install hardware and upgrade International Space Station systems. This photograph was taken by an Expedition 63 crew member inside the cupola, the orbiting lab's "window to the world."

JSC2013-E-013362 (February 2013) --- Portrait of Expedition 35/36 Flight Engineer Chris Cassidy of NASA. Photo credit: Gagarin Cosmonaut Training Center

Expedition 36 Flight Engineer Chris Cassidy waves hello after he and, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos landed their Soyuz TMA-08M spacecraft in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 36 Flight Engineer Chris Cassidy talks to family on a staellite phone shortly after he and, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos landed their Soyuz TMA-08M spacecraft in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 63 NASA astronaut Chris Cassidy is seen outside the Soyuz MS-16 spacecraft after he landed with Roscosmos cosmonauts Ivan Vagner and Anatoly Ivanishin in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 63 NASA astronaut Chris Cassidy is seen outside the Soyuz MS-16 spacecraft after he landed with Roscosmos cosmonauts Ivan Vagner and Anatoly Ivanishin in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 36 Flight Engineer Chris Cassidy of NASA is helped out of the Soyuz TMA-08M capsule after he and, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos landed in a Soyuz TMA-08M spacecraft in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 36 Flight Engineer Chris Cassidy of NASA rest on a helicopter after he and, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos landed in their Soyuz TMA-08M capsule in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

iss063e010102 (May 8, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy is pictured in the International Space Station's Harmony module working on maintenance tasks.

iss063e010080 (May 8, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy is pictured in the International Space Station's Harmony module working on maintenance tasks.

jsc2020e017093 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA has his Sokol suit pressure checked ahead of his launch on a Soyuz rocket with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, Vagner, Anatoly Ivanishin of Roscosmos, and Chris Cassidy of NASA lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017094 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA has his Sokol suit pressure checked ahead of his launch on a Soyuz rocket with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, Vagner, Anatoly Ivanishin of Roscosmos, and Chris Cassidy of NASA lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017092 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA has his Sokol suit pressure checked ahead of his launch on a Soyuz rocket with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, Vagner, Anatoly Ivanishin of Roscosmos, and Chris Cassidy of NASA lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017095 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA gives a thumbs up as he has his Sokol suit pressure checked ahead of his launch on a Soyuz rocket with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, Vagner, Anatoly Ivanishin of Roscosmos, and Chris Cassidy of NASA lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017098 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA has his Sokol suit pressure checked ahead of his launch on a Soyuz rocket with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, Vagner, Anatoly Ivanishin of Roscosmos, and Chris Cassidy of NASA lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017097 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA has his Sokol suit pressure checked ahead of his launch on a Soyuz rocket with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, Vagner, Anatoly Ivanishin of Roscosmos, and Chris Cassidy of NASA lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

iss063e110548 (Oct. 19, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy works on research hardware inside the JAXA (Japan Aerospace Exploration Agency) Kibo laboratory module.

iss063e087568 (Sept. 10, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy replaces components inside the Waste and Hygiene Compartment, the International Space Station's bathroom located inside the Tranquility module.

iss063e030599 (June 18, 2020) --- (From left) Expedition 63 Commander Chris Cassidy and Flight Engineer Bob Behnken work on U.S. spacesuit maintenance inside the International Space Station's Quest airlock.

iss063e033672 (June 28, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy shows off the helmet of a U.S. spacesuit during maintenance inside the Quest airlock.

iss063e028479 (July 1, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy is pictured inside the Bigelow Expandable Activity Module (BEAM) during operations to retrieve charcoal filters.

iss063e002821 (April 23, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy performs maintenance on the Combustion Integrated Rack, a research device that enables safe fuel, flame and soot studies in microgravity.

iss063e044599 (July 13, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy swaps a hard disk drive during computer maintenance on the robotics work station which controls and commands the Canadarm2 robotic arm.

ISS035-E-022906 (18 April 2013) --- In the Harmony node aboard the International Space Station, NASA astronaut Chris Cassidy works with the Capillary Flow Experiment (CFE).

ISS035-E-022379 (17 April 2013) --- Russian cosmonauts Pavel Vinogradov (center) and Roman Romanenko (right) donned their Orlan spacesuits once again on the International Space Station on April 17. The two are seen with NASA astronaut Chris Cassidy outside the Pirs Docking Compartment airlock during a suited ?dry run? dress rehearsal of the procedures they will conduct during a scheduled April 19 spacewalk. Cassidy will remain inside the orbiting complex throughout the spacewalk.

Expedition 63 NASA astronaut Chris Cassidy is helped out of the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Anatoly Ivanishin, and Ivan Vagner, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 63 NASA astronaut Chris Cassidy is helped out of the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Anatoly Ivanishin, and Ivan Vagner, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 63 NASA astronaut Chris Cassidy is helped out of the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Anatoly Ivanishin, and Ivan Vagner, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 35 crew members NASA Flight Engineer Chris Cassidy waves farewell to family and friends as he departs the Cosmonaut Hotel to suit-up for his soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/Victor Zelentsov)

Expedition 35 NASA Flight Engineer Chris Cassidy performs the traditional door signing before he and fellow crewmates, Soyuz Commander Pavel Vinogradov and Flight Engineer Alexander Misurkin depart the Cosmonaut Hotel for their Soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 63 NASA astronaut Chris Cassidy is helped out of the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Anatoly Ivanishin, and Ivan Vagner, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 36 Flight Engineer Chris Cassidy of NASA is helped out of the Soyuz TMA-08M capsule after he and, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos landed in a Soyuz TMA-08M spacecraft in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 36 Flight Engineer Chris Cassidy of NASA is helped out of a helicopter at the Karaganda airport in Kazakhstan after having been flown from the Soyuz TMA-08M spacecraft landing site in a remote area near the town of Zhezkazgan, Wednesday, Sept. 11, 2013. Cassidy, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 36 Flight Engineer Chris Cassidy of NASA is carried to the medical tent shortly after he and, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos landed in their Soyuz TMA-08M capsule in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 63 NASA astronaut Chris Cassidy is helped out of the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Anatoly Ivanishin, and Ivan Vagner, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 63 NASA astronaut Chris Cassidy is helped out of the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Anatoly Ivanishin, and Ivan Vagner, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 35 Flight Engineers Alexander Misurkin, foreground, and Chris Cassidy watch a video as the crew bus departs the Cosmonaut Hotel on Thursday, March 28, 2013 in Baikonur, Kazakhstan. The launch of the Soyuz spacecraft with Misurkin, Cassidy and Soyuz Commander Pavel Vinogradov launched at 2:43 a.m. local time on March 29. Photo Credit: (NASA/GCTC/Irina Peshkova)

Expedition 36 Flight Engineer Chris Cassidy of NASA waves during a ceremony at the Karaganda airport in Kazakhstan after having been flown from the Soyuz TMA-08M spacecraft landing site in a remote area near the town of Zhezkazgan, Wednesday, Sept. 11, 2013. Cassidy, Commander Pavel Vinogradov of Russian Federal Space Agency (Roscosmos), and Flight Engineer Alexander Misurkin of Roscosmos returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

iss063e017199 (May 26, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy unloads a bag packed with fresh food from Japan's resupply ship, the H-II Transfer Vehicle-9 (HTV-9), that had arrived at the International Space Station the day before.

iss063e068516 (Aug. 12, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy poses for a portrait in front of the Microgravity Science Glovebox as he was setting up the Packed Bed Reactor Experiment inside the research device. The new science hardware is exploring technology to support water recovery, planetary surface processing and oxygen production.

iss063e087493 (Sept. 10, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy calls down to Mission Control and gets ready for high-flying, orbital plumbing work inside the Waste and Hygiene Compartment, the International Space Station's bathroom located inside the Tranquility module.

iss063e078755 (Aug. 27, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy replaces components inside the Combustion Integrated Rack to support a series of ongoing flame and fuel studies known as Advanced Combustion via Microgravity Experiments (ACME).

iss063e084515 (Sept. 4, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy poses with two Astrobee robotic assistants during visual and navigation tests inside the Kibo laboratory module from JAXA (Japan Aerospace Exploration Agency).

iss063e001782 (April 21, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy works on the Fluids Integrated Rack (FIR) replacing components in the research device that studies the behavior of fluids in microgravity. The FIR will help promote the design of advanced space-based fuel tanks and other complex fluid transfer systems.

iss063e087971 (Sept. 11, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy poses for a portrait wearing his flight suit inside the cupola, the International Space Station's window to the world. The orbiting lab was flying above the Pacific Ocean northeast of Papua New Guinea when this photograph was taken.

iss063e084529 (Sept. 4, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy poses with two Astrobee robotic assistants during visual and navigation tests inside the Kibo laboratory module from JAXA (Japan Aerospace Exploration Agency).

iss063e001804 (April 21, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy works on the Fluids Integrated Rack (FIR) replacing components in the research device that studies the behavior of fluids in microgravity. The FIR will help promote the design of advanced space-based fuel tanks and other complex fluid transfer systems.

iss063e049933 (July 16, 2020) --- NASA astronaut Chris Cassidy works during a six-hour spacewalk to install lithium-ion batteries on the International Space Station's truss structure. The orbiting lab was above the north Pacific Ocean flying into a sunrise with a tiny waning crescent Moon in the background at the time this photograph was taken.

ISS036-E-022157 (20 July 2013) --- A fisheye lens attached to an electronic still camera was used to capture this image of the International Space Station’s Cupola and NASA astronaut Chris Cassidy (mostly out of frame at bottom), Expedition 36 flight engineer.

ISS035-E-013815 (2 April 2013) --- Expedition 35 crew members enjoy a meal in the Zvezda service module aboard the Earth-orbiting International Space Station on April 2. From the left are Russian cosmonauts Pavel Vinogradov and Roman Romanenko, Canadian astronaut and Expedition 35 Commander Chris Hadfield and Russian cosmonaut Alexander Misurkin. Not pictured are NASA astronauts Tom Marshburn and Chris Cassidy.

Expedition 35/36 NASA astronaut Chris Cassidy, left on screen, is seen on a live feed from the International Space Station as they participate in a public event at NASA Headquarters observing the first anniversary of the Curiosity rover's landing on Mars, Tuesday, August 6th, 2013 in Washington. Photo Credit: (NASA/Carla Cioffi)

Expedition 63 NASA astronaut Chris Cassidy smiles from inside the Soyuz MS-16 spacecraft just minutes after he and Roscosmos cosmonauts Ivan Vagner, and Anatoly Ivanishin, landed in a remote area near the town of Zhezkazgan, Kazakhstan on Thursday, October 22, 2020, Kazakh time (Oct. 21 Eastern time). Cassidy, Ivanishin and Vagner returned after 196 days in space having served as Expedition 62-63 crew members onboard the International Space Station. Photo Credit: (NASA/GCTC/Denis Derevtsov)

Expedition 35 Flight Engineer Chris Cassidy is seen talking to family members after donning his Russian Sokol suit in preparation for his launch aboard the Soyuz rocket, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 NASA Flight Engineer Chris Cassidy has his Russian Sokol suit pressure checked ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 crew members NASA Flight Engineer Chris Cassidy, left, Soyuz Commander Pavel Vinogradov and Russian Flight Alexander Misurkin, right, wave farewell to family and friends as they depart the Cosmonaut Hotel to suit-up for their soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 NASA Flight Engineer Chris Cassidy is helped into his chair in order to pressure check his Russian Sokol suit ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 NASA Flight Engineer Chris Cassidy has his Russian Sokol suit pressure checked ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/GCTC/Irina Peshkova)

Expedition 35 crew members NASA Flight Engineer Chris Cassidy, left, and Soyuz Commander Pavel Vinogradov wave farewell to family and friends as they depart the Cosmonaut Hotel to suit-up for their soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/Victor Zelentsov)

Expedition 35 Flight Engineer Chris Cassidy is seen talking to family members after donning his Russian Sokol suit in preparation for his launch aboard the Soyuz rocket, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 NASA Flight Engineer Chris Cassidy is helped into his Russian Sokol suit as he and fellow crewmates, Soyuz Commander Pavel Vinogradov, and Flight Engineer Alexander Misurkin prepare for their Soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/GCTC/ Irina Peshkova)

Expedition 35 NASA Flight Engineer Chris Cassidy has his Russian Sokol suit pressure checked ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 crew members NASA Flight Engineer Chris Cassidy, left, Soyuz Commander Pavel Vinogradov and Russian Flight Alexander Misurkin, right, depart the Cosmonaut Hotel to suit-up for their soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/Victor Zelentsov)

Expedition 35 Flight Engineer Chris Cassidy is seen talking to family members after donning his Russian Sokol suit in preparation for his launch aboard the Soyuz rocket, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 crew members NASA Flight Engineer Chris Cassidy, left, Soyuz Commander Pavel Vinogradov and Russian Flight Alexander Misurkin, right, wave farewell to family and friends as they depart the Cosmonaut Hotel to suit-up for their soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 NASA Flight Engineer Chris Cassidy has his Russian Sokol suit pressure checked ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 NASA Flight Engineer Chris Cassidy has his Russian Sokol suit pressure checked ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 35 Flight Engineer Alexander Misurkin, left, Soyuz Commander Pavel Vinogradov, right, and Flight Engineer Chris Cassidy, back left, watch a video as the crew bus departs the Cosmonaut Hotel on Thursday, March 28, 2013 in Baikonur, Kazakhstan. The launch of the Soyuz spacecraft with Misurkin, Vinogradov and Cassidy launched at 2:43 a.m. local time on March 29. Photo Credit: (NASA/GCTC/Irina Peshkova)

Expedition 36 Flight Engineer Chris Cassidy of NASA, left, Commander Pavel Vinogradov of the Russian Federal Space Agency (Roscosmos), center, and, Flight Engineer Alexander Misurkin of Roscosmos, sit in chairs outside the Soyuz TMA-08M capsule just minutes after they landed in a remote area near the town of Zhezkazgan, Kazakhstan, on Wednesday, Sept. 11, 2013. Vinogradov, Misurkin and Cassidy returned to Earth after five and a half months on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 35 NASA Flight Engineer Chris Cassidy is helped into his Russian Sokol suit as he and fellow crewmates, Soyuz Commander Pavel Vinogradov, and Flight Engineer Alexander Misurkin prepare for their Soyuz launch to the International Space Station, Thursday, March 28, 2013, in Baikonur, Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Vinogradov and Misurkin on a five and a half month mission aboard the International Space Station. Photo Credit: (NASA/GCTC/ Irina Peshkova)

Expedition 35 NASA Flight Engineer Chris Cassidy has his Russian Sokol suit pressure checked ahead of his launch onboard a Soyuz TMA-08M spacecraft to the International Space Station, Thursday, March 28, 2013, at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket will send Cassidy, Soyuz Commander Pavel Vinogradov and Russian Flight Engineer Alexander Misurkin on a five and a half-month mission aboard the International Space Station. Photo Credit: (NASA/GCTC/Irina Peshkova)

iss063e041665 (July 9, 2020) --- Roscosmos Flight Engineers (from left) Anatoly Ivanishin and Ivan Vagner practice a simulated emergency evacuation of the International Space Station on a computer inside the Zvezda service module. The duo with Expedition 63 Commander Chris Cassidy (out of frame) spent the afternoon reviewing procedures for quickly entering their Soyuz MS-16 crew ship for a rapid undocking and Earth re-entry.

iss063e041648 (July 9, 2020) --- Roscosmos Flight Engineer Ivan Vagner practices a simulated emergency evacuation of the International Space Station on a computer inside the Zvezda service module. Vagner spent the afternoon reviewing procedures for quickly entering the Soyuz MS-16 crew ship for a rapid undocking and Earth re-entry with crewmates Anatoly Ivanishin of Roscosmos and Chris Cassidy of NASA (both out of frame).

iss063e015430 (May 25, 2020) --- Expedition 63 crew members (from left) Chris Cassidy and Ivan Vagner wear personal protective equipment (PPE) before opening the hatch and entering Japan's resupply ship, the H-II Transfer Vehicle-9 (HTV-9). The PPE is necessary before entering a newly-arrived cargo craft to prevent dust and other irritants that may have become dislodged during the spacecraft's launch from entering the airways and the eyes.

iss063e041647 (July 9, 2020) --- Roscosmos Flight Engineer Anatoly Ivanishin practices a simulated emergency evacuation of the International Space Station on a computer inside the Zvezda service module. Ivanishin spent the afternoon reviewing procedures for quickly entering the Soyuz MS-16 crew ship for a rapid undocking and Earth re-entry with crewmates Ivan Vagner of Roscosmos and Chris Cassidy of NASA (both out of frame).

iss063e026156 (6/11/2020) --- A view of NASA Astronaut Chris Cassidy during the Spectrum Experiment hardware setup aboard the International Space Station (ISS). Spectrum takes fluorescent images of biological specimens contained within a controlled environment. A high resolution, monochrome camera captures images of fluoresced proteins of plants within Petri plates.

jsc2020e017112 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA applies a mission sticker to the interior of the crew bus as he, Anatoly Ivanishin, and Ivan Vagner of Roscosmos arrive at the launch pad, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off on a Soyuz rocket for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)...

jsc2020e017109 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA waves farewell as he, Anatoly Ivanishin, and Ivan Vagner of Roscosmos depart building 254 via bus for the launch pad, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off on a Soyuz rocket for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)...

jsc2020e017122 - Expedition 63 Crew Waves Farewell - Expedition 63 crewmembers Ivan Vagner of Roscosmos, top, Chris Cassidy of NASA, center, and Anatoly Ivanishin wave goodbye as they prepare to climb aboard the Soyuz MS-16 rocket at Site 31 at the Baikonur Cosmodrome in Kazakhstan, Thursday, April 9, 2020. They launched a short time later to the International Space Station for the start of a six-and-a-half month mission. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017124 - Expedition 63 Crew Waves Farewell - Expedition 63 crewmember Chris Cassidy of NASA waves goodbye as he, and cosmonauts Ivan Vagner and Anatoly Ivanishin of Roscosmos, prepare to climb aboard the Soyuz MS-16 rocket at Site 31 at the Baikonur Cosmodrome in Kazakhstan, Thursday, April 9, 2020. They launched a short time later to the International Space Station for the start of a six-and-a-half month mission. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017129 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA, left, waves farewell as he, Anatoly Ivanishin and Ivan Vagner of Roscosmos depart for the launch pad, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off on a Soyuz rocket for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/Victor Zelentsov)...

jsc2020e017126 - Expedition 63 Crew Waves Farewell - Expedition 63 crewmembers Ivan Vagner of Roscosmos, Chris Cassidy of NASA, and Anatoly Ivanishin of Roscosmos climb aboard the Soyuz MS-16 rocket at Site 31 at the Baikonur Cosmodrome in Kazakhstan, Thursday, April 9, 2020. They launched a short time later to the International Space Station for the start of a six-and-a-half month mission. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017082 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA, left, Anatoly Ivanishin of Roscosmos, center, and Ivan Vagner of Roscosmos pose for a group photo after suiting up and preparing for leak checks of their launch and entry suits at the Baikonur Cosmodrome in Kazakhstan as they prepared for launch Thursday, April 9, 2020 on the Soyuz MS-16 spacecraft. A few hours later, they lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017065 - Expedition 63 Preflight - Expedition 63 crewmembers Chris Cassidy of NASA, left, and Anatoly Ivanishin, center, and Ivan Vagner of Roscosmos leave their Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan to travel to their suit up facility for launch on the Soyuz MS-16 rocket from the Baikonur Cosmodrome, Thursday, April 9, 2020. They are beginning a six-and-a-half month mission on the International Space Station.Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017119 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA walks to board the Soyuz rocket with NASA Director for Human Space Flight Programs, Russia, Tricia Mack on right, ahead of launch with Anatoly Ivanishin and Ivan Vagner of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, the trio lifted off on a Soyuz rocket for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)...

jsc2020e017113 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA gives a thumbs up onboard the crew bus as he, Anatoly Ivanishin, and Ivan Vagner of Roscosmos arrive at the launch pad, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off on a Soyuz rocket for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)...

jsc2020e017078 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA dons his Sokol suit a few hours ahead of his launch on a Soyuz rocket with Ivan Vagner and Anatoly Ivanishin of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017127 - Expedition 63 Crew Waves Farewell - Expedition 63 crewmember Chris Cassidy of NASA waves farewell as he, Anatoly Ivanishin and Ivan Vagner of Roscosmos climb aboard the Soyuz MS-16 rocket at Site 31 at the Baikonur Cosmodrome in Kazakhstan, Thursday, April 9, 2020. They launched a short time later to the International Space Station for the start of a six-and-a-half month mission. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017081 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA dons his Sokol suit a few hours ahead of his launch on a Soyuz rocket with Ivan Vagner and Anatoly Ivanishin of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017066 - Expedition 63 Preflight - Expedition 63 crewmembers Chris Cassidy of NASA, left, and Anatoly Ivanishin, center, and Ivan Vagner of Roscosmos leave their Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan to travel to their suit up facility for launch on the Soyuz MS-16 rocket from the Baikonur Cosmodrome, Thursday, April 9, 2020. They are beginning a six-and-a-half month mission on the International Space Station.Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017077 - Expedition 63 Preflight - Expedition 63 crewmember Chris Cassidy of NASA dons his Sokol suit a few hours ahead of his launch on a Soyuz rocket with Ivan Vagner and Anatoly Ivanishin of Roscosmos, Thursday, April 9, 2020 at the Baikonur Cosmodrome in Kazakhstan. A few hours later, they lifted off for a six-and-a-half month mission on the International Space Station. Photo Credit: (NASA/GCTC/Andrey Shelepin)

jsc2020e017121 - Expedition 63 Crew Waves Farewell - Expedition 63 crewmembers Ivan Vagner of Roscosmos, top, and Chris Cassidy of NASA wave goodbye as they and Anatoly Ivanishin of Roscosmos prepare to climb aboard the Soyuz MS-16 rocket at Site 31 at the Baikonur Cosmodrome in Kazakhstan, Thursday, April 9, 2020. They launched a short time later to the International Space Station for the start of a six-and-a-half month mission. Photo Credit: (NASA/GCTC/Andrey Shelepin)