Battalion, 9th Aviation 5th Support Battalion (Main) to 709th Support Battalion (Main) During fiscal year 1987 the army decided to inactivate the division's 2nd brigade, which would be replaced by the 81st Infantry Brigade (Mechanized) of the Washington Army National Guard. The 2nd brigade was inactivated on 15 August 1988 along with the following units: 2nd Combined Arms Battalion Heavy, 47th Infantry 3rd Combined Arms Battalion Heavy, 60th Infantry 6th Battalion, 11th Field Artillery (inactivated 15 September 1988) 209th Support Battalion On the same date the 1st Battalion, 33rd Armor, which until then had been attached to the division, was assigned to the division. With the inactivation of the 2nd brigade the remaining units were reassigned among the remaining brigades: 1st brigade now consisted of 2nd Combined Arms Battalion Heavy, 2nd Infantry, 1st Battalion, 33rd Armor, and 4th Combined Arms Battalion Light, 23rd Infantry. 3rd brigade consisted of 2nd Light Attack Battalion, 1st Infantry, 3rd Combined Arms Battalion Light, 47th Infantry, and 2nd Combined Arms Battalion Heavy, 60th Infantry. The 2nd Combined Arms Battalion Heavy, 23rd Infantry was assigned to the 9th Cavalry Brigade. Organization 1988 McGrath writes that the 9th Infantry Division was organized as follows in 1988: 9th Infantry Division (Motorized), Fort Lewis, WA Headquarters & Headquarters Company 1st Brigade Headquarters & Headquarters Company 1st Battalion, 33rd Armor 2nd Combined Arms Battalion Heavy, 2nd Infantry 4th Combined Arms Battalion Light, 23rd Infantry 3rd Brigade Headquarters & Headquarters Company 2nd Light Attack Battalion, 1st Infantry 3rd Combined Arms Battalion Light, 47th Infantry 2nd Combined Arms Battalion Heavy, 60th Infantry 81st Infantry Brigade (Mechanized), (Washington Army National Guard), Seattle, WA Headquarters & Headquarters Company 1st Battalion, 303rd Armor 1st Battalion, 803rd Armor 1st Battalion, 161st Infantry (Mechanized) 3rd Battalion, 161st Infantry (Mechanized) 2nd Battalion, 146th Field Artillery (M109 155mm self-propelled howitzers) 181st Support Battalion Troop E, 303rd Cavalry 898th Engineer Company Battery D, 216th Air Defense Artillery (Minnesota Army National Guard) - did not exist after 1993 9th Cavalry Brigade (Air Combat) Headquarters & Headquarters Troop 1st Squadron, 9th Cavalry (8 × AH-1F Cobra, 12 × OH-58C Kiowa, 2 × UH-60A Black Hawk) 2nd Battalion, 9th Aviation (30 × UH-60A Black Hawk & 16 × CH-47D Chinook) 1st Battalion, 9th Aviation (21 × AH-1F Cobra & 13 × OH-58C Kiowa, a second attack helicopter battalion was scheduled to be activated) 2nd Combined Arms Battalion Heavy, 47th Infantry Division Artillery Headquarters