ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Mitchell Carrell, 28th Civil Engineer Squadron firefighter, drinks water after hiking in the sun to keep hydrated at Rapid Creek Trail Head, Rapid City, S.D., 16 June. While working outside in the heat, drinking water will assist in regulating the body temperature, preventing overheating. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)