Backup Spaceflight Participant Barbara Barrett, left, backup Expedition 21 Commander Aleksandr Skvortsov, center, and backup Expedition 21 Flight Engineer Shannon Walker are seen during a press conference, Tuesday, Sept. 29, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Backup Expedition 21 Commander Aleksandr Skvortsov speaks during the State Commission meeting to approve the Soyuz launch of Expedition 21 Flight Engineer Jeffrey N. Williams, Expedition 21 Flight Engineer Maxim Suraev, and Spaceflight Participant Guy Laliberté on Tuesday, Sept. 29, 2009 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)

From left, Spaceflight Participant Guy Laliberté, Expedition 21 Flight Engineer Maxim Suraev, Expedition 21 Flight Engineer Jeffrey N. Williams, Backup Spaceflight Participant Barbara Barrett, backup Expedition 21 Commander Aleksandr Skvortsov, and backup Expedition 21 Flight Engineer Shannon Walker are seen during a press conference, Tuesday, Sept. 29, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Williams, Suraev and Laliberté are scheduled to launch onboard a Soyuz rocket to the International Space Station (ISS) on Wednesday, Sept. 30, 2009 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

From left, Spaceflight Participant Guy Laliberté, Expedition 21 Flight Engineer Maxim Suraev, Expedition 21 Flight Engineer Jeffrey N. Williams, Backup Spaceflight Participant Barbara Barrett, backup Expedition 21 Commander Aleksandr Skvortsov, and backup Expedition 21 Flight Engineer Shannon Walker pose for a group photograph at the end of a press conference, Tuesday, Sept. 29, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Williams, Suraev and Laliberté are scheduled to launch onboard a Soyuz rocket to the International Space Station (ISS) on Wednesday, Sept. 30, 2009 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

From left, Spaceflight Participant Guy Laliberté, Expedition 21 Flight Engineer Maxim Suraev, Expedition 21 Flight Engineer Jeffrey N. Williams, Backup Spaceflight Participant Barbara Barrett, backup Expedition 21 Commander Aleksandr Skvortsov, and backup Expedition 21 Flight Engineer Shannon Walker are seen during the State Commission meeting to approve the Soyuz launch of Williams, Suraev, and Laliberté on Tuesday, Sept. 29, 2009 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)

Spaceflight Participant Guy Laliberté, front left, Expedition 21 Flight Engineer Maxim Suraev, front center, and Expedition 21 Flight Engineer Jeffrey N. Williams prepare to have their Russian Sokol suits pressure tested while the backup crew members look on, from back left, Backup Spaceflight Participant Barbara Barrett, backup Expedition 21 Commander Aleksandr Skvortsov, and backup Expedition 21 Flight Engineer Shannon Walker, prior to the crews launch onboard a Soyuz rocket to the International Space Station on Wednesday, Sept. 30, 2009 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Guy Laliberté, front left, Expedition 21 Flight Engineer Maxim Suraev, front center, and Expedition 21 Flight Engineer Jeffrey N. Williams prepare to have their Russian Sokol suits pressure tested while the backup crew members look on, from back left, Backup Spaceflight Participant Barbara Barrett, backup Expedition 21 Commander Aleksandr Skvortsov, and backup Expedition 21 Flight Engineer Shannon Walker, prior to the crews launch onboard a Soyuz rocket to the International Space Station on Wednesday, Sept. 30, 2009 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 39 Soyuz commander Aleksandr Skvortsov is seen in quarantine, behind glass, during the final press conference be Monday, March 24, 2014, at the Cosmonaut Hotel in Baikonur, Kazakhstan. The mission to the International Space Station is set to launch March 26 from the Baikonur Cosmodrome. Photo Credit: (NASA/Joel Kowsky)

Expedition 39 backup crew member Aleksandr Samokutyaev of the Russian Federal Space Agency, Roscosmos, is seen in quarantine, behind glass, during the final press conference held ahead of the launch of Expedition 39 prime crew members; Soyuz Commander Alexander Skvortsov of the Russian Federal Space Agency, Flight Engineer Steve Swanson of NASA, and Flight Engineer Oleg Artemyev of Roscosmos, to the International Space Station, Monday, March 24, 2014 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 21 Flight Engineer Maxim Suraev, left and Expedition 21 Flight Engineer Jeffrey N. Williams, right talk with family and colleagues from behind glass prior to their launch onboard a Soyuz rocket with Spaceflight Participant Guy Laliberté to the International Space Station (ISS), Wednesday, Sept. 30, 2009 in Baikonur, Kazakhstan. Photo Credit: (NASA/Victor Zelentsov)