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Staff Sgt. Erik Nelson, 379th Expeditionary Civil Engineering Squadron heating ventilation air conditioning and refrigeration journeyman uses his voltmeter in search of a electrical short on a chiller behind building 6671 June 27, 2016, at Al Udeid Air Base, Qatar. Nelson and his hvac crew spent six hours on the unit which supplies cool air to the wing operations center. These experts install, maintain, and repair different hvac units at Al Udeid averaging over 25 service calls a day in the hotter months. (U.S. Air Force photo/Technical Sgt. Carlos J. Trevino/Released)
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