The Military Department shall be comprised of (1) the armed forces of the state, as defined in § 27-2, which shall be under the military command and control of the Adjutant General, and (2) the department’s civilian employees. The Military Department shall be under the command and control of the Adjutant General. On or before July 1, 1980, the Governor shall appoint an Adjutant General with the rank of major general to serve for a term of two years from July 1, 1980. Quadrennially thereafter, the Governor shall appoint an Adjutant General with the rank of lieutenant general to serve for a term of four years, from such first day of July and until a successor is appointed and qualified. The Adjutant General shall have had at least fifteen years’ commissioned service in the armed forces of the United States, at least ten years of which shall have been served in the National Guard, and shall have obtained the minimum officer grade of O-5. No person shall be appointed or continue to serve as Adjutant General after reaching the age of sixty-four years. The Adjutant General may be suspended or removed by the Governor in accordance with the provisions of sections 4-11, 4-12 and 4-13.