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Staff Sgt. Erik Nelson, 379th Expeditionary Civil Engineering Squadron heating ventilation air conditioning and refrigeration journeyman removes a panel off a chiller behind building 6671 June 27, 2016, at Al Udeid Air Base, Qatar. Nelson and his hvac/r crew responded to repair the broken unit which supplies cool air to the wing operations center. Hvac crews respond to over 25 calls a day at Al Udeid to repair air conditioning and refrigeration units. (U.S. Air Force photo/Technical Sgt. Carlos J. Treviño/Released)
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