Expedition Terry Virts left signs a ceremonial book at the Gagarin Museum May 8.

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 40/41 backup crewmember Terry Virts of NASA (front row, left) signs a ceremonial book at the Gagarin Museum May 8 as his crewmates, backup Soyuz Commander Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, front row, center) and Samantha Cristoforetti of the European Space Agency (front row, right) look on. In the back row from left to right are the prime crewmembers, Alexander Gerst of the European Space Agency, Max Suraev of Roscosmos and Reid Wiseman of NASA, who are preparing for launch May 29, Kazakh time, in the Soyuz TMA-13M spacecraft from the Baikonur Cosmodrome in Kazakhstan for a 5 ½ month mission on the International Space Station.

NASA/Stephanie Stoll