Stock Photo - Astronaut Jeffrey Williams (center), Expedition 21 flight engineer and Expedition 22 commander, participates in a 1-G extravehicular activity (EVA) training session in the staging area in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Crew trainer Ernest Bell (left) assisted Williams.

Stock Photo: Astronaut Jeffrey Williams (center), Expedition 21 flight engineer and Expedition 22 commander, participates in a 1-G extravehicular activity (EVA) training.

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