U.S. Air Force Staff Sgt. Nazareth Oliver, 18th Aerospace Medicine Squadron aerospace and operational physiology flight NCO in charge of maintenance, adjusts a face mask in the altitude chamber on Kadena Air Base, Japan, June 11, 2013. The chamber on Kadena recently conducted its final operations. Instead, the aerospace and operational physiology flight will switch to a reduced oxygen breathing device in July, which will be used for refresher training for individuals whose flight qualification currency will expire in the future. (U.S. Air Force photo by Airman 1st Class Hailey R. Davis/Released)
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