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U.S. Air Force Airman 1st Class Cesar Avalos, 379th Expeditionary Civil Engineer Squadron heating ventilation and air conditioning journeyman, turns on a nitrogen gas tank at Al Udeid Air Base, Qatar, Aug. 28, 2014. The nitrogen gas is run through the air conditioning unit’s lining of a building for a short period of time to find the source of where there may be a break in the flow of air. Avalos is deployed here from Travis Air Force Base, California and hails from Yuma, Arizona. (U.S. Air Force photo by Staff Sgt. Ciara Wymbs/Released)
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