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Staff Sgt. James Sullivan, left, a 726th Air Mobility Squadron C-17A Globemaster III crew chief, and Staff Sgt. Terry McGivern, a 726 AMS heavy integrated avionics craftsman, don personal protective equipment prior to carrying out liquid oxygen servicing on a C-17A Globemaster III on Ramstein Air Base, Germany, Feb. 26, 2025. Liquid oxygen is a very cold and dangerous substance, requiring personnel to wear several pieces of specialized PPE to protect from severe skin and eye irritation as well as frostbite. Liquid oxygen has many applications onboard aircraft such as breathing oxygen for aircrew and passengers in emergency situations, High Altitude Low Opening operations, and Aeromedical Evacuation purposes. (U.S. Air Force photo by Staff Sgt. Joshua T. Crossman)