U.S. Air Force Col. Stephen Williams, 35th Fighter Wing commander, adjusts the reduce oxygen breathing device version two, controls in the 35th Operations Group building at Misawa Air Base, Japan, March 12, 2013. Prior to receiving a new hypoxia familiarization trainer, pilots would go through physiological training in a low-pressure chamber every five years. (U.S. Air Force photo by Airman 1st Class Kenna Jackson)
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