Senior Airman Antonello Ruggiero, Staff Sgt. Christopher Ernst, Senior Airman Tobiloba Majaro and Master Sgt. Robert Carter of the 914th Civil Engineer Squadron test the flow of electricity within a generator while conducting offsite training in Youngstown, New York, June 10, 2022. Heating, Ventilation and Air Conditioning (HVAC) personnel play a vital role within CES by providing essential services for service members in the field who are always on the move. (U.S. Air Force Photo by Airman Kylar Vermeulen)