List of military headstamps
A headstamp is the marking on the bottom of a cartridge case designed for a firearm. It usually tells who manufactured the case. Military headstamps usually have only the year of manufacture . A letter, number, or alphanumeric code indicates the place of manufacture: Other codes may indicate metal suppliers (like France or The Netherlands) or the percentage of copper in the alloy the cartridge case is made of (like Poland and Germany). United States military cartridges US arsenals World War II manufactured cartridges with a single "4" as the year of production were made in 1944. The demand was so great for cartridges that most manufacturers just ground off the "3" on the "43" stamp to save time. Most wartime plants were closed by the end of the war. Some cartridges with a single "5" were made in 1955. AO or KS Allegheny Ordnance Plant (Kelly Springfield) (1943–1945) – Cumberland, Maryland; Operated by Kelly-Springfield Tire Co., a division of Goodyear Rubber. Conversion back to rubber tire production began in 1944. CB Curtis Bay Ordnance Depot (CBOD) (1917–1957) – Baltimore, Maryland. Used to store, examine, overhaul, and repack ammunition. DEN Denver Ordnance Plant (1941–1945) – Denver, Colorado: a division of