During this period, the Division was converted to a mechanized infantry division, and frequently sent constituent units to Europe to participate in the annual REFORGER exercises to continue the Cold War mission of deterring Communist threats. In 1976 the Division's 4th Brigade was established and permanently stationed forward at Wiesbaden, West Germany as Brigade 76, remaining there until being inactivated in 1984. It was during their time in Fort Carson that the Division assumed the nickname, "Ironhorse". Force XXI In December 1995, the Ivy Division was reflagged at Ft Hood, Tx when the 2nd Armored Division was deactivated as part of the downsizing of the Army. One brigades remained at Ft Carson as 3rd Brigade 4th Infantry Division stationed at Ft Carson. The division became an experimental division of the Army, as it had been in the early 1940s. Until completing the mission in October 2001, 4ID led the Army into the 21st century under Force XXI, the Army's modernization program. The division tested and fielded state-of-the-art digital communications equipment, night fighting gear, advanced weaponry, organization, and doctrine to prepare the Army for the future. From 1989 to 1996 the 116th Cavalry Brigade of the Idaho and Oregon Army National Guard served as roundout brigade of the division. Iraq War 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. Order of battle ìn Iraq War: 1st 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) 2nd Battalion, 8th Infantry Regiment (Mech) 1st Battalion, 67th Armor Regiment 3rd Battalion, 67th Armor Regiment 3rd Battalion, 16th Field Artillery Regiment (155SP) 1st Squadron, 10th Cavalry Regiment 3rd Brigade (Iron) 1st Battalion, 12th Infantry Regiment (Mech) 1st Battalion, 68th Armor Regiment 3rd Battalion, 29th Field Artillery Regiment (155SP) 4th Engineer Battalion 64th Forward Support Battalion 4th Infantry Division Artillery (DIVARTY) 1st Battalion, 44th Air