Senior Airman David Murriel, 2nd Civil Engineering Squadron heating, ventilation, air conditioning/refrigeration technician, cuts away pipe insulation to locate a leak on Barksdale Air Force Base, La., July 24. HVAC/R Airmen are responsible for maintaining and monitoring Barksdale?s humidity levels and heating and cooling systems, in buildings across the base. (U.S. Air Force photo/Airman 1st Class Andrew Moua)(RELEASED)