Airman 1st Class Bethany Dacus, 911th Aircraft Maintenance Squadron crew chief, observes excess liquid oxygen vapors as they vent out of a C-17 Globemaster III at the Pittsburgh International Airport Air Reserve Station, Pennsylvania, March 1, 2021. When servicing the aircraft’s liquid oxygen system, a steady stream of LOX flowing from the system vent will indicate the system is full and servicing is complete.

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Photo credit: © Operation 2021 / Alamy / Afripics
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