Mo. Rev. Stat. § 87.495
Any fire department existing by authority of the laws of this state, or any municipal authority thereof, in any city or county in this state having a population of fifty thousand inhabitants or over, is hereby authorized and empowered to form a pension fund and relief association under the general incorporation laws of this state in relation to benevolent associations, and to create a fund for the purpose of pensioning retired firemen, and affording relief to members of such fire department when sick, or who may become disabled in the service, and to provide a fund for the relief of the families and other dependents of such firemen in case of death, under such rules and regulations as may be enacted by such fire department pension fund and relief association, not inconsistent with sections 87.495 to 87.515 or the laws of this state in relation to benevolent associations.
§ 87.495, RSMo