The police department and/or fire department of any municipality of this state, which municipality is a participating employer as defined in section two (5)) hereof, may withdraw its firemen and/or policemen from the West Virginia Public Employees Retirement System provided the following conditions are met:
(1) City council, by appropriate ordinance, permits all of its policemen of its police department and/or all of its firemen of its fire department to withdraw from the system.