Rather than receiving too little oxygen, the pilots of one of the world’s most advanced fighter aircraft could be taking in too much, according to a NASA assessment of the F-22’s life support system. Pilots of the Raptor have for years experienced breathing difficulties and something now called “Raptor cough.” The Air Force launched serious investigations into the problem in 2008, after pilots reported an increasing number of “hypoxia-like symptoms.” Since that time, the Air Force ...

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