[3] Constituted in July 1917 the brigade was organized and drafted into federal service in August 1917 at Camp Kearny and was demobilized in April 1919 at the same location.

The Army is restructuring and moving from the division to the brigade as the primary building block of combat power.

To this effect the 2nd and 3rd Brigades of the 40th Infantry Division of the California Army National Guard were merged into the 40th IBCT.

However, individual soldiers are in Iraq working in other active duty units or are tasked for border security missions in southern California.

The self-contained and modular structure of the 40th Infantry Brigade Combat Team makes it well suited to provide this support.