Marine Corps Individual Reserve Support Activity The Marine Corps Mobilization Command ( MOBCOM ) is a Major Subordinate Command ( MSC ) of Marine Forces Reserve and provides support for all Individual Ready Reserve ( IRR ) , Individual Mobilization Augmentee ( IMA ) and Mobilized Training Unit Marine reservists . Individual Ready Reserve : MOBCOM exercises centralized command and administration of the IRR . The IRR is composed of former Active Duty or Reserve component personnel who have not completed their Military Service Obligation ( MSO ) or have completed their MSO and are in the Ready Reserve by voluntary agreement . Garrison Richards - Gebaur Air Force Base Synopsis of IRR Obligations . Marines in the IRR are required to contact MOBCOM and submit any changes to current address , e - mail address , phone number , dependents , marital status , and health / VA status via [ www . mol . usmc . mil ] or contacting MOBCOM customer service at [ CSC @ cdc . usmc . mil ] or 800 - 255 - 5082 ext 3395 . They are required to physically or virtually muster when directed . Also must maintain basic uniform items . Reserve Contractual Service Requirements . Officers must resign their commission after completion of 8 - year MSO to be released from the Ready Reserve . Enlisted personnel in good standing must re - enlist to remain in the IRR past their 8 - year MSO . They must also maintain standards of conduct , may only wear Marine Corps uniforms in accordance with regulations , maintain military identification card and are eligible for involuntary recall to Active Duty — although most IRR members are not recalled while in their first or last year in the IRR . Individual Mobilization Augmentee ( IMA ) . MOBCOM oversees and administers the IMA program on order to provide ready Marines for individual augmentation to both Active and Reserve missions . IMA Marines perform a minimum of 48 paid drill periods per fiscal year and a minimum of 12 paid days of Active Duty for training per fiscal year with their assigned unit . Members of the IMA may receive retirement pay and benefits at age 60 if they accumulate 20 qualifying years of service . Mobilization Training Unit ( MTU ) . MOBCOM oversees and administers the MTU program . An MTU is a unit established to provide operational support in a non - pay status . MTU Marines , as drilling reservists , perform a minimum of 40 non - paid drill periods per fiscal year with their assigned unit . Members of the MTU may receive retirement pay and benefits at age 60 if they accumulate 20 qualifying years of service . MOBCOM Mission . Contact , accept , track , screen , and prepare Marines so they are ready for active duty . Provide Ready Marines ! MOBCOM Vision . MOBCOM provides the active forces competent and effective Individual Reserve Marines ( IRR ) , capable of seamlessly integrating with the active forces in order to enhance the operational reach and endurance of the Marine Corps . Formerly known as " Marine Corps Reserve Support Command " ( MCRSC ) Marine Corps Mobilization Command is located on the deactivated Richards - Gebaur Air Force Base in Kansas City , Missouri near Belton , Missouri . External links . , Missouri