 Since its closure due to Base Realignment and Closure
in 1999, the Army's Chemical Corps and the United States Army Chemical, Biological, Radiological and Nuclear (CBRN) School are located at Fort Leonard Wood, Missouri.There are approximately 22,000 members of the Chemical Corps in the U.S. Army, spread among the Active, Army Reserve, and Army National Guard.The school trains officers and enlisted personnel in CBRN warfare and defense with a mission is "To protect the force and allow the Army to fight and win against a CBRN threat.