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Second Lt. Aaron Seyfried, 47th Student Squadron student pilot, awaits a seal check in the hypobaric chamber at the Aerospace Physiology Unit on Laughlin Air Force Base, Texas, April 30, 2014. Undergraduate Pilot Training students are exposed to low-pressure altitude flights to experience the onset of hypoxia, or a lack of oxygen to the blood and brain, as part of the physiology training required of all military aviators. (U.S. Air Force photo/Staff Sgt. Steven R. Doty/Released)
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