§ 4-1. "Service" defined.

(a) In general.

Except as otherwise provided in this section, "service" means the sum of each period of a member's employment with a participating employer.

(b) Exclusions.

Except as provided in subsection (c) of this section, "service" does not include any period of employment:

(1) that has been credited as service under any other City retirement plan for calculating the amount of a retirement benefit or a deferred vested retirement benefit; or

(2) during which the member was not on the active payroll of the participating employer.

(c) Exceptions.

The exclusions of subsection (b) of this section do not apply to any period of employment credited to a hybrid member for service as a Class D member of the Employees' Retirement System.

(d) Transfers of service.

If a member transfers service to any other City retirement plan, that transferred service may not be counted to determine whether the member is vested in his or her employer contribution sub-account.