Tech. Sgt. Ben Jonkman, a crew chief for A-10 Thunderbolt II aircraft at Selfridge Air National Guard Base, Mich., dons protective gear prior to servicing the aircraft with liquid oxygen, Oct. 14, 2018. Liquid oxygen is stored below -297 degrees to maintain it in a liquid form. The extreme cold of the liquid oxygen requires Airmen to wear protective gear when working with it.

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Photo credit: © David Wa / Alamy / Afripics
License: Licensed
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