The Watervliet Arsenal is an arsenal of the United States Army located in Watervliet, New York, on the west bank of the Hudson River. It is the oldest continuously active arsenal in the United States, and today produces much of the artillery for the army, as well as gun tubes for cannons, mortars, and tanks. It has been a National Historic Landmark since 1966. The arsenal was founded in 1813 to support the War of 1812, and was designated as the Watervliet Arsenal in 1817.