Associated Press
An Air Force F-22 Raptor goes through maneuvers during a demonstration at Langley Air Force Base in Hampton, Va., Monday, April 30, 2012. Air Force Gen. Mike Hostage, commander of Air Combat Command, said Monday that the F-22 Raptor is vital to the Air Force and that the service continues to search what is causing hypoxia like symptoms in some pilots.   (AP Photo/Steve Helber)

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