190408-F-SQ280-113
Staff Sgt. Nicholas Mannion, 380th Expeditionary Civil Engineer Squadron Heating, Ventilation, Air Conditioning and Refrigeration journeyman prepares line sets for an A/C installation at Al Dhafra Air Base, United Arab Emirates, April 8, 2019. HVAC Airmen monitor systems operation to ensure efficiency and compliance technical orders, manufacturer handbooks, local procedures, codes, and directives. (U.S. Air Force photo by Senior Airman Mya M. Crosby)