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At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 51 backup crewmember Randy Bresnik of NASA (right) signs in for the start of final crew qualification exams March 30 as his crewmate, Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos, left) looks on. They are backups to Fyodor Yurchikhin of Roscosmos and Jack Fischer of NASA, who will launch April 20 on the Soyuz MS-04 spacecraft from the Baikonur Cosmodrome in Kazakhstan for a four and a half month mission on the International Space Station.