I agree. Obviously a pilots liscense but then what. I now it takes skill to fly those airplanes/Helicopters like they do over some of the fires you see. I bet they get paid well too!
If you are already a FAA rated pilot then I would say you need experience before being hired by an emergency agency. Whether it be rotary wing for EMS transport/firefighting or fixed wing tanker/spotter you need extra training and ratings in the particular type of aircraft, especially helicopters and large fixed wing.
Not to discourage you but it takes lots of money to get rated. Plus with the military doing a lot of flying during current wartime, the competition against veteran pilots entering this field would be fierce.