The rangers make sure that the lands are being used properly and not abused. this area is only 2 or so hours from NYC and also a very large watershed area for NYC. They are also there to maintain certain areas and trails I believe. I will look further into this to give you a better answer, I do know that I have seen rangers in these hills, and they just hike the trails.
"Got tight last night on absinthe and did knife tricks. Great success shooting the knife into the piano. The woodworms are so bad and eat hell out of all furniture that you can always claim the woodworms did it."