Serves as Crew Chief with shift responsibility to direct the operation of two or three major pieces of motorized fire apparatus and the performance of a crew of 6-9 firefighters to combat fires at Military District of Washington, Pentagon Heliport and as required throughout the installation and vicinity. At the site of the fire, while subject to conditions of extreme heat, smoke, gases, dust and all types of weather conditions is responsible for supervising the overall firefighting operation until the arrival of the Fire Chief or Assistant Chief. May be required to direct the crew in firefighting activities without on-the-scene guidance from supervisors. Directs the crew in the performance of standby duty at the station, including maintenance of equipment, execution of practice drills and performance of fire prevention inspections. Occasionally required to serve as shift supervisor. Determines fire origin and cause with assistance from supervisor.