Recognized as an expert on developing and producing artillery and other weapons, Flagler continued his Ordnance service after the war, including assignments at the Watervliet, Augusta, Rock Island, Fort Monroe, Fort Union, San Antonio, Frankford, and Watertown arsenals.
Before the forming of the ARL, the United States Army had research facilities dating back to 1820 when the laboratory at Watertown Arsenal, Massachusetts, studied pyrotechnics and waterproof paper cartridges.
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Throughout the American Civil War, Rodman was commander and superintendent of the Watertown Arsenal, located along the Charles River in Watertown, Massachusetts.