U.S. Air Force Senior Ashviel Cruz Aponte, 74th Expeditionary Fighter Squadron crew chief, services the liquid oxygen system on an A-10 Thunderbolt II attack aircraft at Amari Air Base, Estonia, Oct. 5, 2015. Liquid oxygen is used in aircraft as a source of oxygen for pilots to breathe at high altitudes. (U.S. Air Force photo by Andrea Jenkins/Released)
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