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Airmen train to walk among the stars
A technician works on the full-size mock-up of the International Space Station inside the Neutral Buoyancy Lab Dec. 15 at the Johnson Space Center in Houston. The lab is the world's largest indoor pool containing 6.2 million gallons of water, which is re-filtered every 18 hours. (U.S. Air Force photo/Tech. Sgt. Larry Simmons)

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