Tech. Sgt. Mark McHugh, 374th OSS aerospace physiology technician, describes the features of the base’s new Restricted Oxygen Breathing Device at Yokota Air Base, Japan, Nov. 22, 2022. Pilots and aircrew members train to notice the signs of hypoxia, so they can react appropriately before symptoms set in, such as lightheadedness or the inability to concentrate. (U.S. Air Force photo by Staff Sgt. Ryan Lackey)
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