Mike Montgomery GI Bill MASTER at ARMS 3rd Class Military Airlift Command Marine Corps Exchange Medical Evaluation Board Medical Command Marine Expeditionary Unit College Funds Machinist Mate Mobilization Command Military Occupational Specialty Military Police Military Personnel Flight Military Rapid Armour Program Meal, Ready to Eat Military Spouses Residency Relief Act Mission Support Squadron Military Treatment Facility, or base clinic/hospital Military Training Instructor. Drill sergeant for the USAF. Morale, Welfare, and Recreation