Expedition 50 backup crew members, ESA astronaut Paolo Nespoli, left, Russian cosmonaut Fyodor Yurchikhin of Roscosmos, center, and NASA astronaut Jack Fisher don their Sokol suits ahead of their Soyuz qualification exams, Monday, Oct. 24, 2016, at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia.