LANGLEY AFB, Va. — U.S. Air Force officials are narrowing their focus on new combinations of factors as they explore oxygen deprivation issues that have claimed the life of one F-22 Raptor pilot and have plagued the fleet for more than a year. The officials remain frustrated, however, that a “smoking gun” for the cause of pilot hypoxia is still elusive despite an extraordinary effort by the service to enlist help from scientists, doctors and fighter experts. The F-22 is the Air ...

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