Mo. Rev. Stat. § 41.090: Rules and regulations.

The governor shall make and publish such regulations governing the organization, discipline and training of the militia of the state as may be necessary to the efficiency thereof, and such regulations shall have the authority of law, provided that in the case of the National Guard, or Air National Guard and naval militia, regulations promulgated by the governor shall conform to the statutes and regulations of the United States concerning the same.