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"ANZIO ANNIE" - Aberdeen Proving Ground, Md. - This captured famous German railway gun poured fire into the American forces on the Anzio beachhead in Italy in World War II. In the right background is a U.S. 280mm gun, M65, the Atomic Cannon.
Aberdeen Proving Ground is a United States Army facility located near Aberdeen, Maryland. It is the Army's oldest active proving ground, it was established on October 20, 1917, six months after the United States entered World War I.
The location allowed design and testing of ordnance materiel to take place near contemporary industrial and shipping centers. The first gun was fired there on January 2, 1918. APG was created as a successor to the Sandy Hook Proving Ground, which was too small for some of the larger weapons being tested.
Aberdeen Proving Ground occupies 72,962 acres (114.0 sq mi). Its northernmost point is near the mouth of the Susquehanna River, where it enters the Chesapeake Bay. On the south it is bordered by the Gunpowder River. The installation lies on two peninsulas separated by the Bush River.