I live in Saskatchewan. We use red lights and sirens for Volunteer Firefighter POVs, and they are EMERGENCY VEHICLES. But your particular Municipality must designate POVs as such in a bylaw (optional). If your Municipality says yes, it then falls on the chief's responsibility to decide who out of all the individual firefighters gets approval to use the lights and sirens in their car, and who doesn't. You must pass a SEVO (Saskatchewan Emergency Vehicle Operators) course. Pass all 3 steps, you can fit your car with reds and sirens!
P.S: Rank is irrelevant here! It's down to the municipality, then the chief if municipality says yes, then pass a SEVO if the chief blesses you! If your municipality does NOT make a bylaw designating POVs as emergency vehicles, then this is not permissible.