The mission of the MSG is to establish and maintain an all-volunteer formal military organization as the state's reserve to the Mississippi National Guard (MSNG). The MSG is to assist the MSNG with in-state missions as directed by the Governor and the Adjutant General of Mississippi. The MSG is tasked with assuming the mission of the MSNG should they be fully mobilized outside the state. The MSG is similarly tasked with securing armories, assistance to Guard families, and assuming other duties until the full mobilization ceases. MSG personnel may, at the request of the Adjutant General of Mississippi, be trained in the protection of life and property of the citizens of Mississippi due to natural disasters.