Most recently, the division has been deployed overseas as part of the ongoing Global War on Terrorism, seeing service in Iraq and Afghanistan.

As currently configured, the 40th Infantry Division has oversight and responsibility for the training and readiness of units in California, Oregon, Hawaii, Arizona, Washington, Alaska, New Mexico, Indiana, Nebraska, Nevada, Mississippi, Utah, Guam, and the Northern Mariana Islands.

It was composed of National Guard units from the states of Arizona, California, Colorado, Nevada, New Mexico, and Utah.

When the division arrived in France in August 1918, the Imperial German Army had just completed a series of offensives that started on 21 March and ended on 15 July 1918.

The 40th Division headquarters arrived at the port of New York aboard the USS Artemis on 13 March 1919 after 6 months of overseas service and was demobilized on 20 April 1919 at Camp Kearny, California.

In accordance with the National Defense Act of 1920, the division was allotted to the states of California, Utah, and Nevada, and assigned to the IX Corps.

The division staff, composed of personnel from all three states, came together to conduct joint training for several summers before World War II.

Additionally, the division staff participated in the Fourth Army CPXs held at Fort Lewis, Washington, in 1935 and 1936, and at the Presidio of San Francisco in 1939.

For the 1937 camp, the division participated in the Ninth Corps Area phase of the Fourth Army maneuvers at San Luis Obispo held 2–12 August.

In August 1940, the “Sunburst” Division again participated in the Fourth Army Maneuvers, this time at Fort Lewis as part of the provisional IX Corps.

[4] In early 1941, the personnel from Nevada’s 40th Military Police Company and 2nd Battalion, 115th Engineer Regiment were used to form the 121st Coast Artillery Battalion (Separate) (Antiaircraft), and the military police and engineer units were subsequently reorganized in California, removing Nevada from allocation to the division.

On 20 December 1943, the first units left for Guadalcanal,[3] and by mid-January 1944, movement was completed, and the division prepared for its first combat assignment.

Sailing from Borgen Bay on 9 December 1944, the division made an assault landing at Lingayen, Luzon, under command of XIV Corps, on 9 January 1945.

Seizing Lingayen airfield, the division occupied Bolinao Peninsula and San Miguel, and advanced toward Manila, include the Filipino regular and constable force of the Philippine Commonwealth Army and Philippine Constabulary were recaptured areas around in Luzon at the mainland, running into heavy fighting in the Fort Stotsenburg area and the Bambam Hills.

Shipping out of Oakland and San Francisco, California in late March 1951, the division deployed to Japan for training.

[17] Three members of the division's 223rd Infantry Regiment were awarded the Medal of Honor for their actions during the Korean War: David B.

[1] On 13 August 1965, Lieutenant Governor Glenn M. Anderson called out elements of the division to put down the Watts Riots, at the request of Los Angeles Police Chief William H. Parker.

[1] Like most reserve component units of the Army, the division sat out the Vietnam War, being left unmobilized, apart from its Aviation Company.

Allocated to the United States Army Reserve in peacetime, the mission of the battalion was to provide the division commander and G-2 with electronic warfare intelligence and analysis, as well limited counterintelligence/interrogation support and long range surveillance.

On 29 April 1992, Governor Pete Wilson ordered elements of the 40th Infantry Division to duty to put down the so-called "Rodney King" riots.

The 40th ID responded quickly by calling up some 2,000 soldiers, but could not get them to the city until nearly twenty-four hours had passed, due to a lack of proper equipment, training, and available ammunition, which had to be picked up from Camp Roberts, California (near Paso Robles).

By 1 May, the call-up had increased to 4,000 soldiers continuing to move into the city in Humvees, who were later federalized under Title 10 USC by President George H. W.

[26][27] On 17 January 1994, Governor Pete Wilson activated the 40th Infantry Division (M) to respond to the aftermath of the Northridge earthquake, and emergency services were up and running within five hours of the quake.

During this deployment, Battery F conducted Firefinder counter-battery radar operations, convoys and base security all with little to no armor, with a high threat of mine strikes and ambushes.

National Guard units from California, Oregon, Hawaii, Arizona, Washington, Alaska, New Mexico, Indiana, Nebraska, Utah and Guam were part of the 40th Infantry Division.

The red arrowhead alludes to firepower of the division and represents their assault landing at Luzon in World War II.

It was a combined result of disparaging remarks made by Army regulars about the National Guard division and the appearance of the unit shoulder sleeve insignia.

[35] During the Korean War, members of the 40th Infantry Division raised funds for and built the School at Gapyeong County in 1952.

[37] In addition to the schools, the 40th Infantry Division built hospitals and other public facilities at Kwanin Township in an area called "Sunburst Village.