Garrison flag inside the Old Courthouse at Gateway Arch National Park | Midwest National Parks

Today we celebrate Flag Day and the foundation of the U.S. Army. Did you know? National parks and the military have strong ties going back to the establishment of Yellowstone as the world's first national park in 1872. Learn more athttps://www.nps.gov/subjects/military/index.htm

Image: Garrison flag inside the Old Courthouse at Gateway Arch National Park

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