Air Force Tech. Sgt. Eric Fortenberry (left) and Air Force Airman 1st Class Jerry Timmons, 673d Logistics Readiness Squadron fuels facilities technicians, take a sample of liquid oxygen at Joint Base Elmendorf-Richardson, Alaska, Dec. 4, 2017. Oxygen is pressurized and cooled into a liquid state in order to transport it more efficiently from cryogenic tanks to JBER’s aircraft to provide fresh air to pilots in flight. ( Air Force

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