Car 15 is a Battalion Chief, Car 14 is a Reserve BC and my guess would be that Car 12 is the Chief of the Department or the Assistant Chief of the Department. I live in Center Point and the FD is one of my PRIORITY channels.
Car 10 is the Administrative Fire Chief
Car 12 is the Fire Chief
Car 14 is EMS Officer
Car 15 is a utility truck just used to carry extra things to/from scenes and carry additional personel.
Car 16 is the Fire Marshal
Battalion 1 is the Shift Commander usually a Battalion Chief.
907 is the Volunteer Fire Chief