U.S. Air Force Capt. Joseph Teodoro, 35th Operations Support Squadron aircrew flight equipment flight commander, adjusts the amount of oxygen on the reduce oxygen breathing device during hypoxia familiarization training at Misawa Air Base, Japan, May 20, 2015. This system is designed to allow pilots the ability to experience hypoxia, a lack of oxygen reaching the body, in a controlled situation to identify the symptoms it causes. (U.S. Air Force photo by Airman 1st Class Jordyn Fetter/Released)
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