THE PENTAGON — There is no single “smoking gun” that caused breathing trouble for F-22 Raptor pilots, but rather a “mosaic” of interrelated cockpit equipment issues that led to a chain reaction of glitches resulting in symptoms similar to hypoxia, says Maj. Gen. Charlie Lyon, Air Combat Command’s director of operations. The Air Force believes it has fixed the breathing issues for now, with a plan to replace a valve in a breathing garment vest that simply was not meeting Raptor ...


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