23rd Chemical Battalion
The 23d CBRN Battalion is a Chemical, biological, radiological, nuclear and high-yield explosives defense battalion of the United States Army, part of the 2ID Sustainment Brigade of the 2nd Infantry Division at Camp Humphreys, Korea. It traces its lineage back to the 1944 formation of the 23rd Chemical Smoke Generator Battalion in England during World War II. The 23rd was inactivated after the end of the war and reactivated in 1949 as the 4th Chemical Smoke Generator Battalion, serving in the Korean War before being inactivated in Germany at the end of the 1950s. The 23rd  Chemical Battalion was reactivated in Korea in 1988. History. In a 4 April 2013 ceremony, the 23d Chemical Battalion was officially transferred back to Korea after spending eight years at Joint Base Lewis–McChord. On 16 October 2016, its headquarters and headquarters detachment was redesignated as a company. Composition. The 23d CBRN Battalion is currently composed of: As of 10 June 2013, the following companies were reassigned from the 23rd CBRNE BN.