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Aberdeen Proving Ground (APG) (sometimes erroneously called Aberdeen Proving Grounds) is a U.S. Army facility located adjacent to Aberdeen, Harford County, Maryland, United States. Part of the facility is a census-designated place (CDP), which had a population of 3,116 at the 2000 census, and 2,093 as of the 2010 census.
There are 11 major commands among the tenant units, including
APG is the U.S. Army's oldest active proving ground, established on 20 October 1917, six months after the U.S. entered World War I. The planning and construction were overseen by Brigadier General Colden Ruggles, who later served as the Army's Chief of Ordnance. Its location allowed design and testing of ordnance materiel to take place near contemporary industrial and shipping centers. The proving ground was created as a successor to the Sandy Hook Proving Ground, which was too small for some of the larger weapons being tested. At the peak of World War II, APG had billeting space for 2,348 officers and 24,189 enlisted personnel.
Although civilian contractors produced the major portion of conventional munitions for World War I, the United States government built federally owned plants on Aberdeen Proving Ground for the manufacture of toxic gas. These poison gas manufacturing facilities came to be known as Edgewood Arsenal. Edgewood Arsenal included plants to manufacture mustard gas, chloropicrin and phosgene, and separate facilities to fill artillery shells with these chemicals. Production began in 1918, reached 2,756 short tons (2,500 t) per month, and totaled 10,817 short tons (9,813 t) of toxic gas manufactured at Edgewood Arsenal before the November 1918 armistice.