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https://en.wikipedia.org/wiki/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. It is the largest command in the U.S. Marine Corps.
Marine Forces Reserve is the headquarters command for approximately 40,000 Reserve Marines and 184 Reserve Training Centers located throughout the United States. The mission of Marine Forces Reserve is to augment and reinforce active Marine forces in time of war, national emergency or contingency operations, provide personnel and operational tempo relief for the active forces in peacetime, and provide service to the community (for example, through Toys for Tots).
The United States Marine Corps Reserve was established when Congress passed the Naval Appropriations Act of 29 August 1916 and is responsible for providing trained units and qualified individuals to be mobilized for active duty in time of war, national emergency or contingency operations. Marine forces Reserve also provides personnel and operational tempo relief for active component forces in peacetime.
MARFORRES comprises two groups of Marines and Sailors. The first, known as the Selected Marine Corps Reserve (SMCR), are Marines who belong to reserve units and drill one weekend a month and two weeks a year. The second group is known as the Individual Ready Reserve (IRR). The IRR is composed of Marines who have finished their active duty or USMCR obligations, however their names remain on record to be called up in case of a war or other emergency – the Individual Ready Reserve is administered by the Marine Corps Individual Reserve Support Activity. IRR Marines participate in annual musters to check in with the Corps. Reserve Marines are equipped and trained to the same standards as active Marine forces.