Expedition 23 prime and backup crew members, from left, NASA's Tracy Caldwell Dyson, Russian Aleksander Skvortsov, Russian Mikhail Kornienko, NASA's Scott Kelly, Russian Alexander Samokutyayev, and Russian Andrei Borisenko are seen during the State Commission meeting to approve the Soyuz launch of Caldwell Dyson, Skvortsov and Kornienko, Thursday, April 1, 2010 in Baikonur, Kazakhstan. The crew is kept in a separate room with a glass window in order to help maintain their health. Photo Credit: (NASA/Bill Ingalls)

Expedition 23 Flight Engineer Tracy Caldwell Dyson, front left, Expedition 23 Soyuz Commander Alexander Skvortsov, front center, and Expedition 23 Flight Engineer Mikhail Kornienko pose with backup crewmembers NASA Flight Engineer Scott Kelly of the U.S., back left, Flight Engineer Alexander Samokutyayev of Russia, back center, and Flight Engineer Andrei Borisenko of Russia, prior to the crews’ launch onboard a Soyuz rocket to the International Space Station on Friday, April 2, 2010, in Baikonur, Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 28 Flight Engineer Alexander Samokutyaev is given a routine medical check outside the Soyuz TMA-21 Capsule just minutes after he and Expedition 28 Commander Andrey Borisenko, and Flight Engineer Ron Garan landed in a remote area outside the town of Zhezkazgan, Kazakhstan, on Friday, Sept. 16, 2011. NASA Astronaut Garan, Russian Cosmonauts Borisenko and Samokutyaev are returning from more than five months onboard the International Space Station where they served as members of the Expedition 27 and 28 crews. Photo Credit: (NASA/Bill Ingalls)

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 23 Flight Engineer Tracy Caldwell Dyson (c, in white coat), Soyuz Commander Alexander Skvortsov (to her left) and Flight Engineer Mikhail Kornienko (r) answer questions from reporters following a a ceremony March 21, 2010 prior to their departure for the Baikonur Cosmodrome in Kazakhstan for final training prior to their launch April 2 on the Soyuz TMA-18 spacecraft. Also attending were backup Flight Engineer Scott Kelly (without hat, third from left) and backup Soyuz Commander Alexander Samokutyayev (to Kelly’s left). Credit: NASA/Mark Bowman