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Some background on the 321st:

LINEAGE AR (inactive)Constituted 14 July 1945 in the Army of the UnitedStates as the 321st Headquarters Intelligence Detach-ment and activated in Germany. Inactivated 30 Novem-ber 1946 in Germany Allotted 12 February 1947 to theOrganized Reserves. Activated 26 February 1947 atChicago, Illinois. (Organized Reserves redesignated 25March 1948 as the Organized Reserve Corps; redesig-nated 9 July 1952 as the Army Reserve.) Inactivated31 December 1948 at Chicago, Illinois. Activated 24March 1949 at Chicago, Illinois.Reorganized and redesignated 24 October 1950 asHeadquarters, 321st Military Intelligence Battalion.Inactivated 1 March 1953 at Chicago, Illinois. Redesig-nated 13 February 1996 as Headquarters, Headquar-ters and Service Company, 321st Military IntelligenceBattalion (organic elements concurrently constituted).

http://huachuca-www.army.mil/files/history_milineage.pdf