Stock Photo - Astronaut Jeffrey Williams (center), Expedition 21 flight engineer and Expedition 22 commander; and astronaut Nicole Stott, Expedition 2021 flight engineer, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Crew instructor Michael Steele assisted Williams and Stott.

Stock Photo: Astronaut Jeffrey Williams (center), Expedition 21 flight engineer and Expedition 22 commander; and astronaut Nicole Stott, Expedition 2021 flight engineer.

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