A member of the public employees retirement system who on the effective date of this section is employed as a fireman in a position requiring satisfactory completion of a fire fighter training course approved under section 3303.07 of the Revised Code or conducted under section 3737.33 of the Revised Code may elect to remain a contributing member of the retirement system by giving notice to the system not later than ninety days after the effective date of this section. The election once made is irrevocable.
R.C. §145.013