The 320th Field Artillery Regiment (FAR) is a field artillery regiment of the United States Army.
 A parent regiment under the U.S. Army Regimental System, the 320th FAR currently has two active elements in the 101st Airborne Division (Air Assault): 1st Battalion, 320th FAR (1-320 "Top Guns") in 2nd Brigade Combat Team; and 3rd Battalion, 320th FAR (3-320 "Red Knight Rakkasans") in 3rd Brigade Combat Team.
 The regiment served with the 82nd Airborne Division during World Wars I and II, and regimental elements have served with the 82nd and 101st Airborne Division, the 193rd Infantry Brigade and the Berlin Brigade, and conducted combat operations in the Dominican Republic, Vietnam, Grenada, Operations Desert Shield and Storm, and the Global War on Terror.
The 907th Glider Field Artillery Battalion (907th GFAB), also designated as the 907th Field Artillery Battalion and as the 907th Airborne Field Artillery Battalion, is an inactive field artillery unit of the United States Army.
 The battalion served in three campaigns with the 82nd Division during World War I; with the 101st Airborne Division during World War II, seeing action in four campaigns, including the Invasion of Normandy, Operation Market Garden and the Battle of the Bulge.
 After a brief service in the Organized Reserve from 1948-1950, the battalion returned to active duty and the 101st Airborne Division briefly from 1956-1957, before its final inactivation.
The 1st Battalion, 320th Field Artillery Regiment (1-320 FAR) is the field artillery battalion assigned to the 2nd Brigade Combat Team, 101st Airborne Division.
 The battalion has been assigned to the 82nd Airborne Division, 11th Airborne Division and 101st Airborne Division.
 The battalion has participated in World War I, World War II, Operation Power Pack, Operation Urgent Fury, Operation Desert Storm, Operation Iraqi Freedom, Operation Enduring Freedom, and Operation Inherent Resolve.
The 1st Battalion, 377th Field Artillery Regiment, is an inactive M198 howitzer 155mm field artillery battalion of the United States Army.
 The battalion has seen service with the 101st Airborne Division during World War II and Vietnam, and deployed to Iraq and Afghanistan during the Global War on Terror.
 The battalion has been stationed with the 101st Airborne Division at Fort Campbell; with the 18th Field Artillery Brigade and the 82nd Airborne Division at Fort Bragg, North Carolina; and with the 17th Field Artillery Brigade at Fort Lewis, Washington.
The 3rd Battalion, 320th Field Artillery Regiment (3-320th FAR) is the field artillery battalion assigned to the Division Artillery (DIVARTY), 101st Airborne Division.
 The battalion has been assigned to the 82nd Airborne Division, 11th Airborne Division and 101st Airborne Division.
 The battalion has participated in World War I, World War II, Operation Desert Storm, Operation Enduring Freedom, and Operation Iraqi Freedom.
The 101st Airborne Division Artillery (DIVARTY) is the force fires headquarters for the 101st Airborne Division (Air Assault) at Fort Campbell, Kentucky.
 The DIVARTY has served with the division in World War II, Vietnam, Operations Desert Shield and Storm, Operation Iraqi Freedom, and in peacetime at Camp Breckinridge and Fort Campbell, Kentucky, and Fort Jackson, South Carolina.
 The DIVARTY was inactivated in 2005 as part of transformation to modular brigade combat teams, but was reactivated on 16 October 2014 to provide fire support coordination and mission command for the training and readiness of field artillery units across the division.
The 502nd Infantry Regiment (502nd INF), previously titled the 502nd Parachute Infantry Regiment (502nd PIR), is an airborne infantry regiment of the United States Army.
 The regiment was established shortly after the American entry into World War II, and was assigned as a regiment of the 101st Airborne Division, "The Screaming Eagles", one of the most decorated formations of the U.S. Army.
 The regiment saw substantial action in the European Theater of World War II and was deactivated in 1945, shortly after the end of the war.
 Reactivating in a new form in 1956, the 502nd Infantry has served in the Vietnam War, the first Gulf War, Operation Iraqi Freedom, Operation Enduring Freedom in Afghanistan, and Operation Inherent Resolve in Iraq.
 It was removed from parachute status with the rest of the 101st Airborne Division in 1969, and since 1974, the regiment has been classified as an Air Assault unit.
 Currently, its 1st and 2nd battalions are active.
 Both battalions are assigned to the 2nd Brigade Combat Team, 101st Airborne Division (Air Assault).
Aerial rocket artillery (abbreviated ARA, also called aerial artillery) is a type of armed helicopter unit that was part of the artillery component of the United States Army's two airmobile divisions during the Vietnam War.
 Controlled by division artillery and not the aviation group, the 2nd Battalion, 20th Artillery, 1st Cavalry Division and the 4th Battalion, 77th Artillery, 101st Airborne Division, along with Battery F, 79th Artillery, 1st Cavalry Division, were the only ARA units fielded during that conflict.
 The ARA concept disappeared from Army aviation by the mid-1970s, replaced by more generic attack aviation units.
Don F. Pratt Memorial Museum is an official U.S. Army Museum located in Building 5702 on Tennessee Avenue at Fort Campbell, Kentucky.
 Military artifacts and memorabilia are available to touch and view at the museum which features interior and exterior exhibits that help visitors better reflect on military history.
 Included are helicopters, planes, jeeps, trucks, tanks, captured enemy weapons and equipment from World War II, the Korean War, Vietnam, the Persian Gulf War, Operation Iraqi Freedom and Operation Enduring Freedom in Afghanistan.
 Artifacts on exhibit include a recruiter's jeep from the 1970s and items which had belonged high-ranking Nazi officials including Adolf Hitler, Hermann Goering and Julius Streicher, captured by the 101st Airborne Division in 1945 in Berchtesgaden.
 The main museum theme focuses on the history of Fort Campbell and the 101st Airborne Division, but also visitors experience some of this by stepping inside a restored CG-4A cargo glider.
 The museum also has exhibits dedicated to the 11th Airborne Division, 5th Special Forces Group, 160th Special Operations Aviation Regiment, and the 12th, 14th, and 20th Armored Divisions which trained at Fort Campbell during World War II.
The Gulf War (2 August 199028 February 1991), codenamed Operation Desert Shield (2 August 199017 January 1991) for operations leading to the buildup of troops and defence of Saudi Arabia and Operation Desert Storm (17 January 199128 February 1991) in its combat phase, was a war waged by coalition forces from 35 nations led by the United States against Iraq in response to Iraq's invasion and annexation of Kuwait.

Question: What year did the Gulf War begin that required the force of the 101st Airborne Division Artillery?
Answer: 1991