Today In Wyoming's History: August 25: 1916. National Park Service formed.
The NPS took over a role which had been occupied by the Army, that of patrolling the National Parks. Their uniform still recalls the Army of 1916 to a small extent, in that they've retained the M1911 style campaign hat, in straw and felt, as part of their uniform.
On this, it's also the case here that the Yellowstone just ceased last year using the Army built courthouse, built in 1908, in favor of a newly constructed one. Still, that's pretty good service for a small Army courthouse really.
In 1916, the cavalry branch, which had been heavily involved in patrolling the parks, was committed to the Cold/Lukewarm war with Villa. I wonder if part of the reason that the Park Service came into being in 1916 was because this mounted service was needed to free up the Army's mounted arm for it's primary military role?