Commorating the creation of the National Park Service in 1916, whereby the NPS relieved the United States Army, which was pretty busy with other things, of the duty of patrolling the parks (the Park Service campaign hat recalls the Army's M1911 campaign hat.
The Park Service and the parks themselves are one of the great things about the United States. If you have nothing on the plate today, and have a park nearby, go check it out if you can, unless of course you live in Utah, in which case you can sit in side your hovel and imagine a future in your state in which all the lands have been sold to big money.
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