If for any cause any person contributing to the fund shall cease to be in the service of the City before he shall have become entitled to any compensation, the total amount shall be refunded in full without interest; provided, however, if any such person shall have had returned to him the amount contributed as aforesaid, and shall afterward re-enter the service of the City, he shall not be entitled to the compensation designated unless he shall return to the fund the amount withdrawn, in which event, the required period of service under this part shall be computed from the time he first entered the service of the City, otherwise the date of his period of service shall commence upon re-entry. For those members who became a member of the fund for the first time after January 1, 1988, reference shall be made to Ordinance No. 79-1987, 9-30-1987, § 9 (§ 62-110).