Senior Airman Sarina Trego, 60th Logistics Readiness Squadron cryogenics technician, fills a liquid nitrogen truck for Senior Airman Damien Gish, 60th Aircraft Maintenance Squadron C-5M Super Galaxy crew chief, to service the aircraft Oct. 20 at Travis Air Force Base, Calif. Liquid oxygen is used to pressurize an aircraft and allow the aircrew to breath while flying while liquid nitrogen is used as a fire suppressant. (U.S. Air Force photo by Senior Airman Nicole Leidholm)
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