Me. Const. art. VII, § 4

Standard of organization, armament and discipline. The organization, armament and discipline of the militia and of the military and naval units thereof shall be the same as that which is now or may hereafter be prescribed by the laws and regulations of the United States; and it shall be the duty of the Governor to issue from time to time such orders and regulations and to adopt such other means of administration, as shall maintain the prescribed standard of organization, armament and discipline; and such orders, regulations and means adopted shall have the full force and effect of the law.