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Tech. Sgt. Chad Brock takes an outdoor temperature reading April 11, 2011, at Kandahar Airfield, Afghanistan. The machine is slightly more complicated than a household thermometer; it is a computer designed to find the Wet Bulb Globe Temperature, which measures not just temperature, but overall physical stress created by weather conditions. A computer takes into account things like humidity, wind speed and radiant heat exposure. Sergeant Brock is a bioenvironmental engineering technician assigned to the 451st Expeditionary Air Wing. (U.S. Air Force photo/Senior Airman Willard E. Grande II)
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