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Few military organizations in the United States can trace their history as far back as pre-Revolutionary War days. One such organization is the 156th Field Artillery Battalion whose Battery A many believe to be the oldest military unit in the United States. A Kingston outfit of the New York National Guard, it dates back to 1658.
156th Field Artillery Battalion
United States Army, "156 Field Artillery Battalion, unit history" (1946). World War Regimental Histories. 17.