Mo. Rev. Stat. § 87.020: Creating board of trustees.

In cities, the treasurer, the counselor, the clerk or register, and the comptroller where such office exists, the chief officer of the fire department, three delegates at large from the fire department, to be elected by the members thereof on the first Monday in December of each year, whose term of office shall be for one year, and one delegate from the retired or pensioned list, to be elected by such retired or pensioned members on the first Monday in December of each year, whose term of office shall be for one year, shall constitute and be a board by the name of "The Board of Trustees of the Firemen's Fund". The board shall select from their members a president and secretary; provided, that in villages and incorporated towns the board of trustees of the firemen's pension fund shall consist of the chairman of the village or town trustees, the clerk, counselor or attorney, treasurer and chief officer of the fire department.