Senior Airman Chris Mendoza, a medical professional assigned to the 624th Aeromedical Staging Squadron, Joint Base Pearl Harbor-Hickam, Hawaii, establishes security before treating a simulated casualty during Operation Joint Medic at Nellis Air Force Base, Nev., March 27, 2015. The exercise scenario had the participants treating and evacuating 27 simulated casualties while under fire. (U.S. Air Force photo by Tech. Sgt. Colleen Urban)