Armedbear said:
Rangers are LEO's, but not everyone who wears a ranger-like uniform and works for the Park Service is necessarily a Ranger. The NPS employs a lot of people, ranging from janitors to scientists, and AFAIK they all wear NPS uniforms of one sort or another at work.
^^ What he said.
I live in CO, and spend an awful lot of time in Rocky Mountain National Park. For every actual "Ranger" (LEO) there are probably a dozen people that dress similarly (fee collectors, visitor center employees, naturalists on tours, etc). Here's my litmus test for it: Does the person have a gun on their hip? The rangers who are tasked with LE functions are equipped like police officers, not like toll collectors. Their uniform shirt, pants, and hats may all look alike, but the fee collectors are not armed, nor are the visitor center employees.
That said, a true "ranger" is a LEO, and should be treated as such. Also, I'd go with the same approach that someone else said already. I'd inform if you are ever detained for something in the park (a "contact"). If you are pulled over while driving, or stopped on suspicion of some offense, I'd assume that your "duty to inform" is then in effect. However, if you merely talk to a ranger on the trail, or have a non-investigatory chat with one, I would not consider it necessary to reveal that information.
As always, the wording of
your state's laws make all of the difference in the world!