40 ILCS 5/18-122
Participation shall continue until the date a participant becomes an annuitant, dies, or accepts a refund.
Participation shall not cease during any period an eligible judge is serving with the military or naval forces of the United States while the United States is engaged in any war or for one year after such war, if the judge makes contributions, together with any interest payments which might be required, for delayed contribution payments.
A participant may also apply for creditable service for up to 2 years of military service that need not have followed service as a judge and need not have been served during wartime. However, for this military service not immediately following employment as a judge, the applicant must make contributions to the System (1) at the rates provided in Section 18-133 based upon the judge's rate of compensation on the last date as a participating judge prior to such military service, or on the first date as a participating judge after such military service, whichever is greater, plus (2) if payment is made on or after May 1, 1993, an amount determined by the Board to be equal to the employer's normal cost of the benefits accrued for such military service, plus (3) interest at the effective rate from the date of first membership in the System to the date of payment.
The amendment to this Section made by this amendatory Act of 1993 shall apply to persons who are active contributors to the System on or after November 30, 1992. A person who was an active contributor to the System on November 30, 1992 but is no longer an active contributor may apply to purchase military credit not immediately following employment as a judge within 60 days after the effective date of this amendatory Act of 1993; if the person is an annuitant, the resulting increase in annuity shall begin to accrue on the first day of the month following the month in which the required payment is received by the System. The change in the required contribution for purchased military credit made by this amendatory Act of 1993 shall not entitle any person to a refund of contributions already paid.
40 ILCS 5/18-122