Its mission is to rebuild and repair ground-combat and combat-support equipment and to support installations on the West Coast of the United States.

Today, one of MCLB Barstow's most important facilities is the Marine Corps Logistics Bases' Maintenance Center.

The only other facility of this kind is located at MCLB Barstow's sister installation, Marine Corps Logistics Base Albany.

In 1954, the Commanding General, Marine Corps Depot of Supplies, Roy M. Gulick, moved his flag from San Francisco to Barstow and since then the base has grown in stature, strength and size.In March 1961, the importance of MCLB Barstow increased dramatically with the establishment of the Depot Maintenance Activity.

Yermo Holding and Reconsignment Point opened on July 22, 1942, to control the shipment of supplies into West Coast ports by rail.