Chamber checks
47th Student Squadron Class 15-09 student pilots await a seal check in the hypobaric chamber at the Aerospace Physiology Unit on Laughlin Air Force Base, Texas, April 30, 2014. Students are trained in a pressure-demand system where oxygen in the mask is above ambient pressure permitting breathing above 40,000 feet. Regulators furnish the mask with 100 percent oxygen under pressure to force the oxygen into the lungs, rather than depending on the low pressure produced when the wearer of the mask inhales to pull in the oxygen. (U.S. Air Force photo/Staff Sgt. Steven R. Doty/Released)
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