Hospital Corpsman 3rd Class Michael Barber, from Los Angeles, Hospital Corpsman 3rd Class Mashfik Hossain, from Riverside, Calif., Hospital Corpsman 3rd Class Laurence Lau, from Dallas, and Cmdr. Trevor Carlson, Camp Geiger Branch Medical Clinic department head, work quickly to lower the simulated heat casualty’s body temperature, July 15. During physical activity, the body’s core temperature rises. As it rises, the body regulates itself by producing sweat, but sometimes this isn’t enough to cool the body down. A core temperature of 107.5 can result in irreversible brain damage and 109 could result in a coma or death. (U.S. Navy photo by Danielle M. Bolton/Released)