Each company is under the direction of a captain. The captains are the fire-fighter's immediate supervisor. They work with their companies to carry out the tasks which are assigned to them as a group. The radio call signs of the department limit the use of personal names over the air. The Chief, Deputy Chief, Platoon Chief use the call signs Car One, Car Two, Car Three, respectively.
Captains using their portable or car radios use the name of their company as a call sign.
For example, the captain of Bravo company would use the call sign Bravo. Should a member of his company operate a portable radio, that person would take the name of his company along with his firefighter number as the call sign. For example, Bravo 22. A second acting captain for Bravo company would be known as Bravo Three. Acting Captains assume all of the rights and duties of a captain while performing that job.