jsc2017e129181 (July 26, 2017) --- Cosmonaut Sergey Prokopyev of Roscosmos is a backup crew member for Expedition 54-55. He is also the Flight Engineer for Expedition 56-57.
Date July 26, 2017
jsc2017e129181 (July 26, 2017) --- Cosmonaut Sergey Prokopyev of Roscosmos is a backup crew member for Expedition 54-55. He is also the Flight Engineer for Expedition 56-57.