LOX keeps pilots breathing over Europe
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. As a deployed crew chief, Cruz Aponte will spend the next few months working alongside NATO allies to improve interoperability. (U.S. Air Force photo by Andrea Jenkins/Released)