The 103rd Intelligence and Electronic Warfare (IEW) Battalion traces its earliest lineage to the activation of the 3rd Counterintelligence Corps Detachment on the 3rd of September 1944. Activated in France, the Detachment was immediately thrown into some of the fiercest battles on the Western Front where the unit took part in four major campaigns, including the famous Ardennes-Alsace offensive remembered for its decisive victory over the German Army at the Battle of the Bulge. The Detachment was deactivated two years later in the post-war drawdown but was reactivated in 1949 and saw significant combat throughout the Korean War, taking part in eight campaigns over the course of the war, including the Chinese Communist Force Intervention, and the Second and Third Korean Winters. In 1958, the Detachment was re-designated as the 3rd Military Intelligence Detachment before again being re-designated as the 3rd Military Intelligence Company in 1972. In 1974, the 3rd MI Company was assigned to the 3rd Infantry Division, the “Rock of the Marne” which was based in West Germany.