Expedition 55 prime and backup crew members

Expedition 55 prime crew members Ricky Arnold of NASA, left, Oleg Artemyev of Roscosmos, second from left, and Drew Feustel of NASA, center, pose for a picture with backup crew members Alexey Ovchinin of Roscosmos, second from right, and Nick Hague of NASA, right, at the conclusion of a press conference, Tuesday, March 20, 2018 a the Cosmonaut Hotel in Baikonur, Kazakhstan. Arnold, Artemyev, and Feustel are scheduled to launch to the International Space Station aboard the Soyuz MS-08 spacecraft on Wednesday, March 21.