The 3rd Military Intelligence Company was activated in France in September 1944 as the 3rd Counterintelligence Corps. It was inactivated 2 years later after having participated in 4 World War II campaigns, including Rhineland and Ardennes-Alsace. In 1949, the detachment was reactivated and served in the Korean War. It participated in 8 campaigns including the Chinese Communist Force Intervention and the second and third Korean Winters. During January 1958, the detachment was reorganized and redesignated as the 3rd Military Intelligence detachment and attached to the 3rd Infantry Division. The detachment was assigned to the 3rd Infantry Division in April 1974.