A mobile oxygen system kit sits onboard a C-130J Hercules during the preflight preparation of a high altitude training mission at Little Rock Air Force Base, Ark. on Nov. 16, 2016. The Oxygen system pictured is an integral piece of safety equipment that mitigates hypoxia. (U.S. Air Force photo/Tech Sgt. Brandon Shapiro)

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A mobile oxygen system kit sits onboard a C-130J Hercules during the preflight preparation of a high altitude training mission at Little Rock Air Force Base, Ark. on Nov. 16, 2016. The Oxygen system pictured is an integral piece of safety equipment that mitigates hypoxia. (U.S. Air Force photo/Tech Sgt. Brandon Shapiro) Stock Photo
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A mobile oxygen system kit sits onboard a C-130J Hercules during the preflight preparation of a high altitude training mission at Little Rock Air Force Base, Ark. on Nov. 16, 2016. The Oxygen system pictured is an integral piece of safety equipment that mitigates hypoxia. (U.S. Air Force photo/Tech Sgt. Brandon Shapiro)
AB Forces News Collection / Alamy Stock Photo
Image ID: MY0KK9