CSS is the essential capabilities, functions, activities, and tasks necessary to sustain all elements of operating forces in theater at all levels of war.

3d MLG was originally activated on Camp Courtney, Okinawa, Japan as the 3d Force Service Regiment on 1 May 1958 under the 3d Marine Division (MARDIV).

In August 1965, 3d FSR was officially detached from 3d MARDIV and placed under operational control of Commanding General, Fleet Marine Forces, Pacific.

From 1966 to 1970, 3d FSR was granted funds and provided guidance to conduct fifth echelon maintenance within its capabilities and contract out the remainder instead of returning equipment to the United States which proved to be one of the great logistical decisions of Vietnam.

[5] In early-January 2005, elements of 3d FSSG rapidly deployed to Sri Lanka and Indonesia to support Operation Unified Assistance, the tsunami relief efforts.

As the Pakistanis braced for the impending annual Himalayan winter, III Marine Expeditionary Force deployed elements (approx.