
A television screen as seen from the balcony of the Russian Mission Control Center in Korolev, Russia shows the view from Soyuz TMA-12M as it docks to the International Space Station on Friday, March 28, 2014. Onboard the Soyuz spacecraft are Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos. The crew of three launched at 3:17 a.m. Kazakhstan time on Wednesday, March 26 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Joel Kowsky)

ISS039-E-013576 (20 April 2014) --- Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency watches the April 20 approach of the SpaceX Dragon to the International Space Station, as photographed by one of the Expedition 39 crew members onboard the orbital outpost.

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) answers questions from the media during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA is carried in a chair to a medical tent just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) answers questions from the media during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel wait for the Expedition 39 crew members to be extracted from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA is helped of the Soyuz Capsule just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), center, and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA is carried in a chair to a medical tent just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA answers questions from the media during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Mastracchio, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos, second from left, is welcomed home by family, friends, and government officials at the Chkalovsky airport outside Star City, Russia, Wednesday, May 14, 2014. Tyurin, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft earlier in the day near the town of Zhezkazgan, Kazakhstan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

NASA Flight Surgeon Joseph Schmid waits for the Expedition 39 crew members to be extracted from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) is seen wearing a ceremonial Kazakh hat and robe and holding a matryoshka doll presented to him during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos is seen wearing a ceremonial Kazakh hat and robe presented to him during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Tyurin, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

ISS040-E-000102 (14 May 2014) --- The Soyuz TMA-11M spacecraft departs from the International Space Station and heads for a landing near the town of Zhezkazgan, Kazakhstan on May 14, 2014. Japanese Aerospace Exploration Agency astronaut Koichi Wakata, Expedition 39 commander; along with Russian cosmonaut Mikhail Tyurin, Soyuz commander and Expedition 39 flight engineer, and NASA astronaut Rick Mastracchio, flight engineer, are returning to Earth after more than six months onboard the space station where they served as members of the Expedition 38 and 39 crews.

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) answers questions from the media during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Family, friends, and government officials wait to welcome home Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos at the Chkalovsky airport outside Star City, Russia, Wednesday, May 14, 2014. Tyurin, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft earlier in the day near the town of Zhezkazgan, Kazakhstan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA, left, and NASA Flight Surgeon Joseph Schmid prepare to depart in a helicopter from the Soyuz landing site near the town of Zhezkazgan, Kazakhstan where Mastracchio and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft, Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA is carried in a chair to a medical tent just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), center, and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

ISS038-E-066867 (9 March 2014) --- In the Unity node onboard the Earth-orbiting International Space Station, three Expediton 38 crew members affix their crew insignia just hours before departing the orbital complex. From left to right, foreground, are cosmonauts Oleg Kotov and Sergey Ryazanskiy of Russia's Federal Space Agency (Roscosmos) and astronaut Mike Hopkins of NASA. Looking on in the background are cosmonaut Mikhail Tyurin of Roscosmos, Expedition 39 flight engineer, and Japan Aerospace Exploration Agency (JAXA) astronaut Koichi Wakata, Expedition 39 commander. Out of the frame is NASA astronaut Rick Mastracchio, Expedition 39 flight engineer.

Expedition 39 Flight Engineer Rick Mastracchio of NASA is presented with a box of Karaganda chocolates during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Mastracchio, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA rests in a chair outside the Soyuz Capsule just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA is helped of the Soyuz Capsule just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), center, and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Rick Mastracchio of NASA, is helped out of a helicopter at the Karaganda Airport in Kazakhstan after the two hour flight from the Soyuz landing site near the town of Zhezkazgan, Kazakhstan where Mastracchio and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Soyuz Commander Mikhail Tyurin of Roscosmos landed in their Soyuz TMA-11M spacecraft, Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos smiles during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Tyurin, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos answers questions from the media during a welcome home ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Tyurin, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft just a few hours earlier near the town of Zhezkazgan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Mikhail Tyurin of Roscosmos, left, departs a plane to a crowd of family, friends, and government officials at the Chkalovsky airport outside Star City, Russia, Wednesday, May 14, 2014. Tyurin, Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA landed in their Soyuz TMA-11M spacecraft earlier in the day near the town of Zhezkazgan, Kazakhstan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

ISS039-E-005700 (27 March 2014) --- A view from the International Space Station shows the Soyuz TMA-12M spacecraft shortly before docking of the two orbiting vehicles. Onboard the Soyuz at this time were incoming Expedition 39 crew members -- Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency (Roscosmos) Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos. Onboard the orbiting complex were Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Flight Engineer Rick Mastracchio of NASA and Flight Engineer Mikhail Tyurin of Roscosmos.

ISS039-E-005670 (27 March 2014) --- A view from the International Space Station shows the Soyuz TMA-12M spacecraft shortly before docking of the two orbiting vehicles. Onboard the Soyuz at this time were incoming Expedition 39 crew members -- Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency (Roscosmos) Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos. Onboard the orbiting complex were Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Flight Engineer Rick Mastracchio of NASA and Flight Engineer Mikhail Tyurin of Roscosmos.

ISS039-E-005704 (27 March 2014) --- A view from the International Space Station shows the Soyuz TMA-12M spacecraft shortly before docking of the two orbiting vehicles. Onboard the Soyuz at this time were incoming Expedition 39 crew members -- Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency (Roscosmos) Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos. Onboard the orbiting complex were Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Flight Engineer Rick Mastracchio of NASA and Flight Engineer Mikhail Tyurin of Roscosmos.

ISS039-E-005666 (27 March 2014) --- A view from the International Space Station shows the Soyuz TMA-12M spacecraft shortly before docking of the two orbiting vehicles. Onboard the Soyuz at this time were incoming Expedition 39 crew members -- Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency (Roscosmos) Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos. Onboard the orbiting complex were Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Flight Engineer Rick Mastracchio of NASA and Flight Engineer Mikhail Tyurin of Roscosmos.

ISS039-E-005632 (27 March 2014) --- A distant view from the International Space Station shows the Soyuz TMA-12M spacecraft as a tiny item at frame center shortly before docking of the two orbiting vehicles. Onboard the Soyuz at this time were incoming Expedition 39 crew members -- Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency (Roscosmos) Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos. Onboard the orbiting complex were Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Flight Engineer Rick Mastracchio of NASA and Flight Engineer Mikhail Tyurin of Roscosmos.

Matryoshka Dolls depicting Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), left, Soyuz Commander Mikhail Tyurin of Roscosmos, center, and Flight Engineer Rick Mastracchio of NASA are seen at a welcome ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, has his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Skvortsov, Expedition 39 Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos is scheduled to launch at 3:17 a.m. Kazakhstan Time on Wednesday, March 26. Photo Credit: (NASA/Bill Ingalls)

Ceremonial Kazakh hats and robes are laid out to be presented to Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA at a welcome ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Oleg Artemyev of the Russian Federal Space Agency, Roscosmos, has his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Artemyev, Expedition 39 Soyuz Commander Alexander Skvortsov of Roscosmos and Flight Engineer Steve Swanson of NASA is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26. Photo Credit: (NASA/Joel Kowsky)

ISS039-E-008095 (1 April 2014) --- Expedition 39 Commander Koichi Wakata, representing the Japan Aerospace Exploration Agency (JAXA), seems very elated that three new members of the crew have brought up food and supplies, especially fresh fruit, as depicted in this photo -- among the first sets of imagery documented with all six Expedition 39 crew members onboard the International Space Station. Wakata is in the orbiting outpost's Cupola module.

Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, speaks with his family during Russian Sokol suit pressure checks in preparation for launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Skvortsov, Expedition 39 Flight Engineer Oleg Artemyev of Roscosmos and Flight Engineer Steve Swanson of NASA is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26. (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel race to the landing site as the Soyuz TMA-11M spacecraft lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Steve Swanson of NASA has his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Swanson, Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, and Flight Engineer Oleg Artemyev of Roscosmos is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26. (NASA/GCTC/Irina Peshkova)

Expedition 39 Flight Engineer Steve Swanson of NASA speaks with his family during Russian Sokol suit pressure checks in preparation for launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Swanson, Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, and Flight Engineer Oleg Artemyev of Roscosmos is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26. (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel race to the landing site as the Soyuz TMA-11M spacecraft lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The Soyuz TMA-11M spacecraft is seen as it lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Oleg Artemyev of the Russian Federal Space Agency, Roscosmos, speaks with his family during Russian Sokol suit pressure checks in preparation for launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Artemyev, Expedition 39 Soyuz Commander Alexander Skvortsov of Roscosmos and Flight Engineer Steve Swanson of NASA is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26. (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Steve Swanson of NASA, center, speaks with his family during Russian Sokol suit pressure checks in preparation for launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Swanson, Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, and Flight Engineer Oleg Artemyev of Roscosmos is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26. (NASA/Joel Kowsky)

Ground personnel race to the landing site as the Soyuz TMA-11M spacecraft lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, has his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Skvortsov, Expedition 39 Flight Engineer Steve Swanson of NASA and Flight Engineer Oleg Artemyev of Roscosmos is scheduled to launch at 3:17 a.m. Kazakhstan Time on Wednesday, March 26. Photo Credit: (NASA/GCTC/Irina Peshkova)

Ground personnel race to the landing site as the Soyuz TMA-11M spacecraft lands with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

ISS040-E-000005 (14 May 2014) --- The Soyuz TMA-11M spacecraft's docking probe is seen just after separation from the International Space Station. This photo was among the first group of images downlinked from the station following the start of duty for the three Expedition 40 crew members, who will be joined by three more crew members in approximately two weeks. With Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos and Flight Engineer Rick Mastracchio of NASA onboard, the Soyuz went on to land near the town of Zhezkazgan, Kazakhstan on May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the orbital outpost where they served as members of the Expedition 38 and 39 crews.

ISS040-E-000002 (14 May 2014) --- The Soyuz TMA-11M spacecraft's docking probe is seen just after separation from the International Space Station. This photo was among the first group of images downlinked from the station following the start of duty for the three Expedition 40 crew members, who will be joined by three more crew members in approximately two weeks. With Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos and Flight Engineer Rick Mastracchio of NASA onboard, the Soyuz went on to land near the town of Zhezkazgan, Kazakhstan on May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the orbital outpost where they served as members of the Expedition 38 and 39 crews.

ISS039-E-013481 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013584 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013522 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013369 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013475 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013373 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013352 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013377 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013437 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013501 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

ISS039-E-013540 (20 April 2014) --- This is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost. The spacecraft was captured by the space station and successfully berthed, following the April 20 arrival.

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) is helped of the Soyuz Capsule just minutes after he and Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel prepare to exact the crew from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), left, Soyuz Commander Mikhail Tyurin of Roscosmos, center, and Flight Engineer Rick Mastracchio of NASA, sit in chairs outside the Soyuz TMA-11M capsule and pose for a group photo with the landing team after they landed in a remote area near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

The last of the support personnel are seen working around the Soyuz TMA-11M spacecraft after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel prepare to exact the crew from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Soyuz Commander Mikhail Tyurin of Roscosmos rests in a chair outside the Soyuz Capsule just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) is helped of the Soyuz Capsule just minutes after he and Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Soyuz Commander Mikhail Tyurin of Roscosmos is carried in a chair to a medical tent just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) is carried in a chair to a medical tent just minutes after he and Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) is helped of the Soyuz Capsule just minutes after he and Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel are seen working around the Soyuz TMA-11M spacecraft after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Japan Aerospace Exploration Agency (JAXA) President Naoki Okumura, background left, looks on as a boxes of Karaganda chocolates is presented to Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA at a welcome ceremony, Wednesday, May 14, 2014 at the Karaganda Airport in Kazakhstan. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel prepare to exact the crew from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Flight Engineer Steve Swanson of NASA, left, and Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Roscosmos, right, speak with family members while Flight Engineer Oleg Artemyev of Roscosmos, has his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-12M spacecraft on Tuesday, March 25, 2014 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Artemyev, Expedition 39 Soyuz Commander Alexander Skvortsov of Roscosmos and Flight Engineer Steve Swanson of NASA is scheduled to launch at 3:17 a.m. Kazakhstan time on Wednesday, March 26.

Russian Search and Rescue helicopter team members clean the windows of their helicopter and other support personnel are seen working around the Soyuz TMA-11M spacecraft in the background after the capsule landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel prepare to exact the crew from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) gives a thumbs up to his NASA and Russian partners as he is carried from the Soyuz Capsule just minutes after he and Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

A portable tent for Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA is used for the crew to remove their Russian Sokol suits and to have medical checks after the three landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Soyuz Commander Mikhail Tyurin of Roscosmos is helped out of the Soyuz Capsule just minutes after he and Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Support personnel prepare to exact the crew from the Soyuz TMA-11M spacecraft shortly after it landed with Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) is helped of the Soyuz Capsule just minutes after he and Soyuz Commander Mikhail Tyurin of Roscosmos, and Flight Engineer Rick Mastracchio of NASA, landed in their Soyuz TMA-11M spacecraft near the town of Zhezkazgan, Kazakhstan on Wednesday, May 14, 2014. Wakata, Tyurin and Mastracchio returned to Earth after more than six months onboard the International Space Station where they served as members of the Expedition 38 and 39 crews. Photo Credit: (NASA/Bill Ingalls)

ISS039-E-000067 (11 March 2014) --- As photographed by one of the Expedition 39 crew members aboard the International Space Station, the Soyuz TMA-10M spacecraft heads toward Earth with the Expedition 38 crew aboard. Onboard the Soyuz were NASA astronaut Mike Hopkins and cosmonauts Oleg Kotov and Sergey Ryazanskiy. The trio had served 166 days in Earth orbit as members of the Expedition 37 and 38 crews.

ISS039-E-000143 (11 March 2014) --- As photographed by one of the Expedition 39 crew members aboard the International Space Station, the Soyuz TMA-10M spacecraft heads toward Earth with the Expedition 38 crew aboard. Onboard the Soyuz were NASA astronaut Mike Hopkins and cosmonauts Oleg Kotov and Sergey Ryazanskiy. The trio had served 166 days in Earth orbit as members of the Expedition 37 and 38 crews.

ISS039-E-000061 (11 March 2014) --- As photographed by one of the Expedition 39 crew members aboard the International Space Station, the Soyuz TMA-10M spacecraft heads toward Earth with the Expedition 38 crew aboard. Onboard the Soyuz were NASA astronaut Mike Hopkins and cosmonauts Oleg Kotov and Sergey Ryazanskiy. The trio had served 166 days in Earth orbit as members of the Expedition 37 and 38 crews.

ISS039-E-000027 (11 March 2014) --- In the Zvezda service module of the Earth-orbiting International Space Station, Expedition 39 Flight Engineer Mikhail Tyurin, a cosmonaut with Russia's Federal Space Agency, keeps track of the Soyuz TMA-10M spacecraft as it heads toward Earth with the Expedition 38 crew aboard. Onboard the Soyuz were NASA astronaut Mike Hopkins and cosmonauts Oleg Kotov and Sergey Ryazanskiy who had served 166 days in Earth orbit as members of the Expedition 37 and 38 crews.

ISS039-E-000169 (11 March 2014) --- As photographed by one of the Expedition 39 crew members aboard the International Space Station, the Soyuz TMA-10M spacecraft heads toward Earth with the Expedition 38 crew aboard. Onboard the Soyuz were NASA astronaut Mike Hopkins and cosmonauts Oleg Kotov and Sergey Ryazanskiy. The trio had served 166 days in Earth orbit as members of the Expedition 37 and 38 crews.

ISS039-E-005434 (25 March 2014) --- One of the three Expedition 39 crew members currently onboard the International Space Station photographed this image of the departure from Baikonur Cosmodrome in Kazakhstan at 21:18:03 GMT, March 25 (March 26, Kazakh time) of two Russian cosmonauts and a NASA astronaut in the Soyuz TMA12M. Inside the space station were Expediton 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) and Cosmonaut Mikhail Tyurin and NASA astronaut Rick Mastracchio, both flight engineers. Inside the Soyuz on route to meet the present inhabitants was another Expedition 39 trio -- Soyuz Commander Alexander Skvortsov of Rosmosmos and Flight Engineers Steve Swanson of NASA and Oleg Artemyev of Roscosmos.

NASA astronaut Shane Kimbrough participates in a STEM in 30 piece about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Smithsonian's National Air and Space Museum in Washington. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Shane Kimbrough speaks about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Arlington Career Center in Arlington, Virginia. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Shane Kimbrough participates in a live broadcast on Periscope about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Smithsonian's National Air and Space Museum in Washington. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Shane Kimbrough gives Nikola a fist bump after a presentation about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Arlington Career Center in Arlington, Virginia. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Shane Kimbrough speaks about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Arlington Career Center in Arlington, Virginia. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Shane Kimbrough speaks about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Arlington Career Center in Arlington, Virginia. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)