A. The police pension fund shall be administered by a police pension board. In cities in which the provisions of this article are or shall hereafter become mandatory, the board shall be composed of the president of the civil service commission, if there is one, and if there is none, then the head of the governing body of the municipality, and the clerk, the treasurer, the chief of police and three subordinate members of the police department. In cities or towns in which the fund is established by ordinance, the board shall consist of the mayor, or other head of the governing body of the municipality, the clerk, the treasurer and two members of the department.

B. The president of the civil service commission, mayor or other head of the governing body, as the case may be, shall be ex officio chairman, the clerk shall be ex officio secretary, and the treasurer shall be ex officio treasurer of the board.