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NASA astronaut Jeff Williams (right), Expedition 47 flight engineer and Expedition 48 commander; Russian cosmonaut Sergei Volkov (mostly obscured in background), Expedition 45/46 flight engineer; Russian cosmonauts Alexey Ovchinin (left) and Oleg Skripochka, both Expedition 47/48 flight engineers, participate in an emergency scenarios training session in an International Space Station mock-up/trainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.