Research up to and during World War II

Chemical weapons research continued from shortly after the CWS became a permanent branch of the Army in 1920 through World War II. For example, from December 1921 until December 1939, the total number of officers in the CWS ranged from 79 to 92. In 1940, the number rose 

By August 31, 1945, the United States arsenal had 1,343,728 chemical bombs. It should be noted that the 1000-lb bomb was considered the most effective and may have constituted the bulk of that number, though bombs ranged from 10 to 2000 lbs. There were also 6389 chemical 4.2-in. mortars and 13,550,613 chemical mortar rounds (all types). In addition, there were chemical candles, smoke generators, pots, grenades, and shells. 

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