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Expedition 55 backup crewmembers Alexey Ovchinin of Roscosmos (left) and Nick Hague of NASA (right) arrive at the airstrip in Baikonur, Kazakhstan March 4 following a flight from their training base outside of Moscow. They are serving as backups to Ricky Arnold and Drew Feustel of NASA and Oleg Artemyev of Roscosmos, who will launch March 21 on the Soyuz MS-08 spacecraft for a five month mission on the International Space Station.