Before revision: Unit expertise is divided into four main functional areas: Command and Control, Engineering, Emergency Management, and Operations, which consists of Electrical Systems, Power Production, Mechanical Systems, Utility/Fuel Systems, Horizontal (Heavy Equipment), and Vertical (Structural) Flights.
After revision: Heating, Ventilation, Air Conditioning/Refrigeration (HVAC/R),Unit expertise is divided into four main functional areas: Command and Control, Engineering, Emergency Management, and Operations, which consists of Electrical Systems, Power Production, Mechanical Systems, Utility/Fuel Systems, Horizontal (Heavy Equipment), and Vertical (Structural) Flights.