Airman 1st Class Johnathan Daniels, Heating, Ventilation, Air Conditioning/Refrigeration and Control technician assigned to the 99th Civil Engineer Squadron, repairs a broken water pipe at a 57th maintenance facility on Nellis Air Force Base. HVAC technicians are responsible for the maintenance, repair and operations of 661 facilities across Nellis, Creech Air Force Base, and the Nevada Test and Training Range. (U.S. Air Force photo by Airman Bailee A. Darbasie)