§ 503. Excluded periods.

Years of Credited Service shall exclude the following periods:

A.

Any period credited for a similar purpose under any other retirement system of the Employer shall not be included in years of Credited Service, except that this exclusion shall not apply if the other retirement system is a Plan maintained under Sections 403 or 457 of the Internal Revenue Code;

B.

If a Participant withdraws his Basic Employee Contributions as described in Section 705 hereof, the Participant's Credited Service for all periods before the withdrawal shall be canceled; and

C.

If a Participant has no vested interest at a time of Termination of Employment and receives payment in accordance with Section 402 hereof, the Participant's Credited Service for all periods before the payment shall be canceled.