"HVAC/R"
Alfredo Marchiori, 31st Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration technician, cuts a hot water pipe, Feb. 19, 2013, at Aviano Air Base, Italy. HVAC/R technicians maintains the integrity of the hot-water systems, which provide hot water to Aviano work centers throughout the base including dormitories, communication rooms, temporary lodging facility and the Exchange. (U.S. Air Force photo/Airman 1st Class Deana Heitzman)