James Baldwin, 733rd Logistics Readiness Squadron fuels facilities fuels distribution systems operator, fills a liquid oxygen cart at Joint Base Langley-Eustis, Va., April 7, 2017. According to Air Force standards liquid oxygen has to be at least percent pure. ( Air Force photo/Staff Sgt. Areca T. Bell)

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Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
Model Released: No

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