Hot times
Senior Airman Ryan Hosten, 96th Aeropace Medicine Squadron, checks the water level in the Wet Bulb Globe Temperature detector July 27 at Eglin Air Force Base, Fla. The WBGT is what the Air Force uses as the "heat index." The heat index is influenced by air temperature, radiant heat and humidity. It is also adjusted for the contributions of work demands, clothing and acclimatization. (U.S. Air Force photo/Samuel King Jr.)