[5] In November 1927, elements of the 184th Infantry Regiment were mobilized to assist with quelling a riot at Folsom State Prison.

On 5 July, elements of the 184th Infantry Regiment, along with other members of the California National Guard, were mobilized to restore order in San Francisco's waterfront when hostilities during the strike escalated.

Most of the soldiers believed that they would be mobilized for a year and then sent home, which changed on 7 December 1941 when the Japanese attacked Pearl Harbor.

The regiment was scattered throughout a number of areas including Del Mar, La Mesa, and Lindbergh Field, while Company A was sent to San Clemente Island.

[5][17] In June 1942, while at the Presidio, the regiment was relieved from the 40th Infantry Division and attached directly to the Western Defense Command.

In November 1942, while still officially under the control of the Western Defense Command, the regiment was attached to the 7th Infantry Division at Fort Ord and later Amphibious Training Force Nine.

After an unopposed landing, the regiment found that the Japanese garrison had been evacuated by a large cruiser and destroyer force on 28 July.

Approximately five days later, when the Battle of Kwajalein was over, more than 8,000 Japanese soldiers of the 61st Naval Guard Force were killed in action.

General George C. Marshall, Chairman of the Joint Chiefs of Staff, later said that the operations on Kwajalien were the most efficient of the war.

Once again, the regiment achieved another first, as they were the first National Guard unit to seize and hold territory that Japan held prior to the start of the war.

The Japanese were long accustomed to fighting in the jungle, and had over three years of occupation to learn the terrain and plan defenses.

In keeping with their motto, "Let's Go," the 184th, using a rainstorm to cover their movements, outflanked the Japanese positions and effectively cut off their forces on the Chenin Peninsula.

[5] On 1 November 1976, the 184th Infantry was reorganized to consist of the 1st battalion, an element of the 40th Armored Division of the California National Guard.

[5] In April 1992, elements of the first battalion were mobilized under state and federal control in response to the Los Angeles riots.

Soldiers from the 1st Battalion provided security at Camp Doha and at several Patriot missile battery sites along the border with Iraq.

In early January 2005, the battalion moved to Fort Polk in Louisiana for a readiness evaluation prior to movement into theater.

In late January 2005, the battalion arrived in Kuwait to acclimate and conduct final training and organization prior to moving into Iraq.

In late February 2005, the battalion arrived in Baghdad, Iraq and was attached to the 4th Brigade Combat Team, 3d Infantry Division.

The battalion provided security during the constitutional referendum held on 15 October and the election of the Council of Representatives on 15 December.

[4] On 1 September 2005, Soldiers assigned to the first battalion's rear detachment (not forward deployed to Iraq) were mobilized under federal control as part Task Force California in response to Hurricane Katrina.

[25] The Soldiers were sent to New Orleans, Louisiana as part of Task Force California to help restore order to the city and surrounding area and provide humanitarian assistance.

The Soldiers who mobilized in support of relief operations in the aftermath of Hurricane Katrina were released from active duty on 11 November 2005.

[27] On 22 October 2007, elements of the 1st Battalion were mobilized under state control in response to widespread wildfires near San Diego.

In addition to other elements of the California National Guard, the battalion used Montgomery Airfield as their primary base of operations to conduct local civil support missions throughout San Diego County.

In addition, elements of the battalion augmented local authorities throughout the area, conducting patrols of evacuated neighborhoods and manning checkpoints.

[28][29] As a link to their progenitors of the 2d Infantry Regiment (California) in World War I, Montgomery Airfield is located two miles south of MCAS Miramar, which was previously named Camp Kearny.

Camp Kearny was the site where many of the soldiers in the 2d Infantry Regiment (California) were mobilized and demobilized for service during World War I.

The two companies also were awarded the Meritorious Unit Commendation as part of the 230th Combat Support Sustainment Battalion, Tennessee Army National Guard.

[35] In November 2009, the task force departed Kosovo to conduct demobilization operations at Fort Lewis near Seattle, Washington and returned to California a few weeks later.

[37] For a year, elements of the Regiment, deployed to Qatar to provide security for the Al Udeid Air Base.