Cavalry Brigade (Air Attack) 3rd Squadron, 5th Cavalry 9th Aviation Battalion 268th Attack Helicopter Battalion Company A, 214th Aviation Battalion Division Artillery 2nd Battalion, 4th Field Artillery 1st Battalion, 11th Field Artillery 3rd Battalion, 34th Field Artillery 1st Battalion, 84th Field Artillery Battery E, 333rd Field Artillery Division Support Command 1st Support Battalion (Forward) 2nd Support Battalion (Forward) 3rd Support Battalion (Forward) 4th Support Battalion (Aviation) 5th Support Battalion (Main) 1st Battalion, 4th Air Defense Artillery 9th Signal Battalion 15th Engineer Battalion 109th Military Intelligence Battalion 9th Chemical Company 9th Military Police Company 9th Division Band In case of war with the Warsaw Pact the division's would have reinforced the Allied Forces Baltic Approaches Command defending Denmark. By 1984 the 9th Cavalry Brigade (Air Attack) was testing motorcycles for reconnaissance work in its reconnaissance squadron, the 3rd Squadron, 5th Cavalry Regiment. And the 9th Infantry Division (MTZ) tested motorized infantry doctrine at the Yakima Firing Center in Eastern Washington, at the National Training Center at Fort Irwin California and in Korea during the annual Team Spirit exercise. While the motorized units performed well they were vulnerable to heavier mechanized forces, particularly if forced to stand and fight. They were also extremely vulnerable to indirect (artillery) fires. On 1 April 1984, Echo Company of the 15th Engineer Battalion reorganized to form the 73rd Engineer Company (Assault Ribbon Bridge), which was assigned to I Corps, which in turn attached it as separate company to the 15th Engineer Battalion. With the switch from Combat Arms Regimental System to the United States Army Regimental System the division saw a few of its units reflagged or inactivated: 15 September 1986: Company A, 214th Aviation Battalion inactivated 2 October 1986: 2nd Battalion, 4th Field Artillery to 3rd Battalion, 11th Field Artillery 2 October 1986: 3rd Battalion, 34th Field Artillery to 6th Battalion, 11th Field Artillery 16 March 1987: 3rd Squadron, 5th Cavalry to 1st Squadron, 9th Cavalry 16 April 1987: 2nd Battalion, 77th Armor to 1st Battalion, 33rd Armor 1987: 9th Aviation Battalion to 1st Battalion, 9th Aviation 1987: 268th Attack Helicopter Battalion to 2nd Battalion, 9th Aviation 16 March 1988: 1st Battalion, 4th Air Defense Artillery to 1st Battalion, 44th Air Defense Artillery unknown date: 1st Support Battalion (Forward) to 99th Support Battalion 2nd Support Battalion (Forward) to 109th Support Battalion 3rd Support Battalion (Forward) to 209th Support Battalion 4th Support Battalion (Aviation) to 3rd