Tech. Sgt. John Thompson, 911th Aircraft Maintenance Squadron crew chief, pushes a liquid oxygen cart into place on the flight line before servicing the LOX on a C-17 Globemaster III at the Pittsburgh International Airport Air Reserve Station, Pennsylvania, March 1, 2021. Liquid oxygen is essential for aircrew to have breathable air while flying.

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Photo credit: © Operation 2021 / Alamy / Afripics
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