1. Any active member who has completed five or more years of actual (not purchased) creditable service shall be entitled to a vested retirement benefit equal to the annual service retirement allowance provided in sections 169.270 to 169.400 payable after attaining the minimum normal retirement age and calculated in accordance with the law in effect on the last date such person was a regular employee; provided, that such member does not withdraw such person’s accumulated contributions pursuant to section 169.328 prior to attaining the minimum normal retirement age.

2. Any member who elected on October 13, 1961, or within thirty days thereafter, to continue to contribute and to receive benefits under sections 169.270 to 169.400 may continue to be a member of the retirement system under the terms and conditions of the plan in effect immediately prior to October 13, 1961, or may, upon written request to the board of trustees, transfer to the present plan, provided that the member pays into the system any additional contributions with interest the member would have credited to the member’s account if such person had been a member of the current plan since its inception or, if the person’s contributions and interest are in excess of what the person would have paid, such person will receive a refund of such excess. The board of trustees shall adopt appropriate rules and regulations governing the operation of the plan in effect immediately prior to October 13, 1961.

3. Should a retirant again become an active member, such person’s retirement allowance payments shall cease during such membership and shall be recalculated upon subsequent retirement to include any creditable service earned during the person’s latest period of active membership in accordance with subsection 2 of section 169.324.

4. In the event of the complete termination of the retirement system established by section 169.280 or the complete discontinuance of contributions to such retirement system, the rights of all members to benefits accrued to the date of such termination or discontinuance, to the extent then funded, shall be fully vested and nonforfeitable.

5. If a member leaves employment with an employer to perform qualified military service, as defined in Section 414(u) of the Internal Revenue Code of 1986, as amended, and dies while in such service, the member’s survivors shall be entitled to any additional benefits (other than benefit accruals relating to the period of qualified military service) that would have been provided had the member resumed employment with the employer and then terminated on account of death in accordance with the requirements of Sections 401(a)(37) and 414(u) of the Internal Revenue Code of 1986, as amended. In such event, the member’s period of qualified military service shall be counted as creditable service for purposes of vesting but not for purposes of determining the amount of the member’s retirement allowance.