ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Mitchell Carrell, 28th Civil Engineer Squadron firefighter, takes a break after moderate work in the sun, Rapid Creek Trail Head at Rapid City, S.D., 16 June. Working too hard in the sun and heat can cause the body to have a heat stroke, which could be fatal. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)