Air Force Lt Col Samuel Mcintyre, NATO Allied Command Transformation deputy chief of staff military assistant, breaths through a mask as he flies a flight simulator during hypoxia training at 1st Operations Group aerospace and operational physiology, Joint Base Langley-Eustis, Va., Dec. 5, 2017. Hypoxia is when the heart and/or lungs can’t provide the blood with the proper amount of oxygen causing the brain and other organs to start failing. ( Air Force photo by Airman 1st Class Tristan Biese)

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Size: 4928px × 3280px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
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Keywords: 1st, 633rd, affairs, air, airman, airmen, base, biese, class, force, jble, joint, langley, langley-eustis, public, tristan, usaf, wing