the Third Army controlled the eastern portion. In November 1945, the two field army commanders organized district "constabularies" based on cavalry groups. The Seventh Army was inactivated in March 1946, in Germany. On 1 May 1946, the zone-wide United States Constabulary headquarters was activated at Bamberg. In mid-1946, the tactical units consisted of the Third Army (Heidelberg) with three infantry divisions (1st, 3rd and 9th) and several separate regiments (3rd, 14th, 29th and 508th Airborne). The 3rd Infantry Division was in the process of being redeployed back to the United States. Another separate infantry regiment - the 5th - was located in Austria but came under the control of US Forces in Austria. In 1947 Headquarters Third Army returned to the United States. From then until the early 1950s, the structure of the American occupation forces consisted of the 1st Infantry Division, a separate infantry regiment, and the U.S. Constabulary of 10 cavalry regiments. From c1947 to 1954, the 351st Infantry Regiment served as the main body of Trieste United States Troops, on the border of Yugoslavia. Cold War On 15 March 1947, United States Forces, European Theater (USFET) was "replaced by the army command known as European Command (EUCOM). ..The Army element of the joint European Command headquarters was initially called Headquarters, U.S. Ground and Service Forces, Europe." On 15 March 1947, HQ USFET was formally redesignated Headquarters, European Command (HQ EUCOM) (not to be confused with the present joint command, "USEUCOM", which was formed on 1 August 1952). Between February and June 1948 the headquarters relocated to Campbell Barracks in Heidelberg, where it remained until June 2013. The Army element of the joint European Command headquarters was initially called Headquarters, U.S. Ground and Service Forces, Europe. On 15 November 1947, U.S. Ground and Service Forces, Europe, was renamed U.S. Army, Europe (USAREUR) to accord with the new Department of the Army nomenclature for such commands. USAREUR was a nonoperational, "paper" organization that provides the ground and service commander with the command functions required for administrative and logistical support. To it were assigned all ground and service units in the command except those assigned to the Office of Military Government, United States; to the Office of the Commander in Chief of European Command; to U.S. Air Forces Europe; to the U.S. Navy, Germany; and to a few exempted War Department agencies. The offices and personnel of the general and