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Lt. Col. Jay Flottmann explains how a valve in the upper pressure garment and the shape and size of oxygen-delivery hoses and connection points contributed to previously unexplained physiological issues during F-22 Raptor flights. He spoke during a press conference in Washington, D.C., July 31, 2012. Flottmann is a flight surgeon and 325th Fighter Wing chief of flight safety. (U.S. Air Force photo/Senior Airman Christina Brownlow)
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