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Maj. Gen. Charles Lyon speaks about a new valve that regulates the proper flow of oxygen to an F-22 Raptor pilot’s vest in Washington, D.C., July 31, 2012. The valve will begin testing next month and should be installed by the end of the year. Lyon is the director of operations at Headquarters Air Combat Command. (U.S. Air Force photo/Senior Airman Christina Brownlow)
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