U.S. Air Force Capt. Allison L. Riley, flight nurse,

U.S. Air Force Capt. Allison L. Riley, flight nurse, 514th Aeromedical Evacuation Squadron, 514th Air Mobility Wing, annotates her systems check on a new generation portable therapeutical oxygen system during an aeromedical evacuation training mission onboard a 305th Air Mobility Wing C-17 Globemaster III from Nashville, Tenn., to Joint Base McGuire-Dix-Lakehurst, N.J., July 30, 2017. The mission, which ran from July 29-30, was to teach flight nurses and aeromedical evacuation technicians how to respond to both medical and aircraft emergencies while evacuating sick or wounded personnel from combat zones. (U.S. Air Force photo by Master Sgt. Mark C. Olsen/Released)