Fort Yellowstone is a former United States Army base that currently serves as the administrative headquarters for the Yellowstone National Park.
For 32 years the Army managed Yellowstone National Park from Fort Yellowstone, which helped define how national parks were to be managed. During its thirty-two years at Yellowstone, the Army developed regulations that put much emphasis on conservation.
Under the watchful eyes of the army at Fort Yellowstone, the features and wildlife of Yellowstone National Park were protected from vandalism and extinction. In fact, many of the policies initiated by the army at Fort Yellowstone were later adopted by the National Park Service. In addition, the hats used by the National Park Service rangers (Ranger Stetsons) are descended from the hats originally used in Army uniforms of the time.
Fort Yellowstone was designated a National Historic Landmark on July 31, 2003.