Guardsmen tackle challenges of keeping their cool
OPERATION ENDURING FREEDOM -- Master Sgt. Alex Gonzalez repairs an environmental control unit used to cool tents at a forward-deployed location. He is the 40th Expeditionary Civil Engineer Squadron's heating, ventilation, air conditioning and refrigeration flight superintendent and is deployed from Muniz Air National Guard Base, Puerto Rico. (U.S. Air Force photo by Staff Sgt. Joceyln Rich)