379th ECES: Day on the job with HVAC
U.S. Air Force Staff Sgt. Gerald Leon Guerrero, 379th Expeditionary Civil Engineer heating ventilation and air conditioning craftsman throws a line down for nitrogen gas to Airman 1st Class Cesar Avalos, 379th ECES heating ventilation and air conditioning journeyman, at Al Udeid Air Base, Qatar, Aug. 28, 2014. The nitrogen gas is used to find the source of where there may be a break in cool air. Leon Guerrero is from Tamuning, Guam, and is deployed from Cannon Air Force Base, New Mexico. 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)