Miss. Code Ann. § 33-7-103: Miss. Code Ann. § 33-7-103

All officers of the Mississippi National Guard, except the Adjutant General, shall hold office until retired for age or disability, be honorably discharged at their own request, or be dismissed pursuant to a sentence of a general court-martial. The Governor may, however, at his discretion, refuse to accept the resignation of an officer. If an organization of the Mississippi National Guard be disbanded or mustered out of the service, such officers of said organization shall be put on the reserve list, subject to the further needs of the National Guard. If any officer of the Mississippi National Guard leaves the jurisdiction of the state and leaves his company or organization station for such a length of time that he ceases to exercise the functions of his commission or warrant so as to cease to be an officer in fact, his action will be deemed to have the effect of a resignation, and his commission may be terminated by the Governor. However, the Governor shall have the power to grant an officer a leave of absence for any reasonable length of time without prejudice to his commission or warrant.