The regiment was part of the 40th Infantry Division during wartime and a unit of the California National Guard during peacetime.

[1][2][3] On 1 September 1950, the 40th Infantry Division became part of the active army from the National Guard.

[4] The regiment was commanded by Colonel James L. Richardson, nicknamed Walking Jim.

[4] Company L of the 3rd Battalion regiment conducted a limited predawn raid against Chinese-held bunkers and entrenchments along a ridge known as The Boot on 18 February.

A platoon commander was killed by mortar fragments, while Richardson's radio operator was mortally wounded on the ridge.

Richardson, who was slightly wounded, carried his radio operator down to a tank at the bottom of the ridge for evacuation, after deciding to disengage.

[6] The 224th's tank company destroyed ten enemy bunkers in an action at the end of February.

On 3 April, the regiment was deployed onto the frontline due to a boundary change with the 2nd Infantry Division.

The 224th Infantry was moved to Pusan under the 2nd Logistical Command on 5 July to guard prisoners of war in the area.

[4] On 2 September 1952, a replacement 224th Infantry Regiment was formed as a National Guard unit in Ontario.