United States Marine Corps Reserve
The Marine Forces Reserve (MARFORRES or MFR), also known as the United States Marine Corps Reserve (USMCR) and the U.S. Marine Corps Forces Reserve, is the reserve force of the United States Marine Corps. The Marine Corps Reserve is an expeditionary, warfighting organization and primarily designed to augment and reinforce the active duty units of the Marine Corps in their expeditionary role.
Source: Wikipedia — United States Marine Corps Reserve (CC BY-SA 4.0)