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Tech. Sergeant Christopher Tilstra, heating ventilation air conditioning and refrigeration craftsman with the 379th Expeditionary Civil Engineer Squadron, sprays an air conditioning unit with a pressure sprayer to remove dirt and dust Aug. 14, 2008, at an undisclosed air base in Southwest Asia. The 379th ECES is responsible for providing mission critical and comfort cooling for equipment and personnel deployed in scorching desert heat. Sergeant Tilstra, a native of Hawarden, Iowa, is deployed from Grand Forks Air Force Base, N.D., in support of Operations Iraqi Freedom, Enduring Freedom and Joint Task Force-Horn of Africa. (U.S. Air Force photo by Staff Sgt. Darnell T. Cannady/Released)
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