My goodness, I thank you. I was actually never officially a park ranger, but was an archaeologist. Actually, many of the folks you see in uniform in a NP are not actually rangers, but may be wild life biologists, geologists, or many other kinds of scientists.
When it hits the fan, your job title means little. You turn off the game on the tube, and go deal with the problem,especially if you have a special skill, aptitude, or training. Keeps one on one's toes.
Actually, you can now distinguish a park ranger (NPS)if that person has a LE commission. They will have a larger badge, and are usually armed. The better ones are also fully informed about the resources of the park and can answer any questions, and will be happy to do so.
Most parks have an able, active volunteer corps. I have been a volunteer at my park (Channel Islands) since I retired, so I am still having fun. Volunteers often do very interesting things, well beyond what visitor would experience.
I am sure your background would be very useful in many, if not most parks. Keeping the critters happy and the ecology shipshape is a major task.
_________________________
Geezer in Chief