Those guys are all Park Service. National parks are a small percentage of the backcountry here and there's only one park in the whole state with any real expanse of backcountry, Rocky Mtn. National Park.
The park is a tourist attraction. The park has people to take your money at the gate, gift shops and snack bars, public restrooms, crowded campgrounds, crowded "scenic overlooks," and such. Also, a metric ton of regulations to enforce, like no dogs on the trail, no camping within x feet of water, lots of special fishing regs, etc. Apples and oranges compared to forest service lands, as far as any need to patrol the backcountry.
Which is why I generally avoid the park and have never seen anyone patrolling the backcountry in my 20 years here.
