The division returned to the United States in July 1945 and was stationed at Camp Butner North Carolina, preparing for deployment to the Pacific. After the war ended it was deactivated on 5 March 1946. It was reactivated as a training division at Fort Ord, California on 15 July 1947. Alerted on 19 January 2003, the 4th Infantry Division was scheduled to take part in the Iraq War in the spring of 2003 by spearheading an advance from Turkey into northern Iraq. The Turkish Parliament refused to grant permission for the operation and the division's equipment remained offshore on ships during the buildup for the war (see below). Its original mission, holding 13 Iraqi divisions along the " Green Line" in northern Iraq, was executed by joint Task Force Viking. Bring on the Strykers;1st BCT, 4th ID switches mission | Army Times". armytimes.com . Retrieved 21 July 2014.

On 13 December 2003, elements of the 1st Brigade Combat Team participated in Operation Red Dawn with United States special operations forces, who captured Saddam Hussein, former President of Iraq. [13] Armor". U.S. Army Center of Military History. Archived from the original on 14 May 2011 . Retrieved 15 June 2012. Armor". U.S. Army Center of Military History. Archived from the original on 21 May 2011 . Retrieved 15 June 2012. The division went north to Ahrweiler, Germany, in the Rheinland-Pfalz area. In July the division returned to France and the last detachment sailed for the United States on 31 July 1919.Brigade (Raider) 1st Battalion, 8th Infantry Regiment (Mech) - Detached From 3rd Brigade 1st Battalion, 22nd Infantry Regiment (Mech) 1st Battalion, 66th Armor Regiment 3rd Battalion, 66th Armor Regiment 4th BN, 42nd Field Artillery Regiment (155SP) 2nd Brigade (WarHorse)

On 1 April 1957, the division was reorganized as a Pentomic Division. The division's three infantry regiments (the 8th, 12th and 22nd) were inactivated, with their elements reorganized into five infantry battle groups (the 1-8 IN, 1-12 IN, 1-22 IN, 2-39 IN and the 2-47 IN). KC Cady. "The Battle of Kamdesh - A True Story of American Valor". Youtube. Archived from the original on 11 July 2017 . Retrieved 19 February 2016.For the Battle of Saint-Mihiel, the division moved into an area south of Verdun as part of the First United States Army. General John Pershing, commander of the American Expeditionary Force (AEF) on the Western Front, had gotten the French and British to agree that the AEF would fight under its own organizational elements. One of the first missions assigned to the AEF was the reduction of the Saint-Mihiel salient. The 4th Division, assigned to V Corps, was on the western face of the salient. The plan was for V Corps to push generally southeast and to meet IV Corps who was pushing northwest, thereby trapping the Germans in the St. Mihiel area. On 1 October 1963, the division was reorganized as a Reorganization Objective Army Division (ROAD). Three Brigade Headquarters were activated and Infantry units were reorganized into battalions.