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Expedition 55 backup crewmembers Nick Hague of NASA and Alexey Ovchinin of Roscosmos wave to local school children after arriving 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.