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In this Dec. 10, 2016 photo, pilots perform pre-flight procedures in T-45C Goshawks from Training Air Wing One on the flight deck of the aircraft carrier USS George Washington docked in Norfolk, Va. The U.S. Navy continues to ground a fleet of training jets because of a spike in problems with their oxygen breathing systems. Vice Admiral Mike Shoemaker wrote in a Navy blog post Sunday, April 9, 2017, that instructor pilots have raised concerns over potential "physiological episodes" in the cockpit. (Petty Officer 2nd Class Bryan Mai/U.S. Navy via AP)

In this Dec. 10, 2016 photo, pilots perform pre-flight procedures in T-45C Goshawks from Training Air Wing One on the flight deck of the aircraft carrier USS George Washington docked in Norfolk, Va. The U.S. Navy continues to ground a fleet of training jets because of a spike in problems with their oxygen breathing systems. Vice Admiral Mike Shoemaker wrote in a Navy blog post Sunday, April 9, 2017, that instructor pilots have raised concerns over potential "physiological episodes" in the cockpit. (Petty Officer 2nd Class Bryan Mai/U.S. Navy via AP)

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