Senior Airman Daniel Striggles, a 49th Logistics Readiness Squadron fuels facilities operator, and Senior Airman Christopher Benavente, a 49th LRS fuel cryogenics operator, fill a cart with liquid nitrogen at Holloman Air Force Base, on May 5, 2017. Cryogenics operations involve servicing liquid nitrogen and liquid oxygen to Holloman’s aircraft. The liquid oxygen is pure, almost 99 to 100 percent oxygen, which Holloman’s F-16 pilots breathe during flight, and liquid nitrogen is used for tire services to aircraft.

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Photo credit: © PR Library / Alamy / Afripics
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