The minimum service requirement for a contributing employee is 10 years of service credit as provided in Sections 13-401 and 13-402 of this Article and exclusive of Article 20. The minimum service requirement for a contributing commissioner is 5 years of service credit as provided in Sections 13-401 and 13-402 of this Article and exclusive of Article 20.
In order to establish military service credit under this subsection (b), the applicant must submit a written application to the Fund, including the applicant's discharge papers from military service, and pay to the Fund (i) employee contributions at the rates provided in this Article, based upon the person's salary on the last date as a participating employee prior to the military service or on the first date as a participating employee after the military service, whichever is greater, plus (ii) the current amount determined by the board to be equal to the employer's normal cost of the benefits accrued for such military service, plus (iii) regular interest of 3% compounded annually on items (i) and (ii) from the date of entry or re-entry as a participating employee following the military service to the date of payment. Contributions must be paid in full before the credit is granted. Credit established under this subsection may be used for pension purposes only.
Notwithstanding any other provision of this Section, a person may not establish creditable service under this Section for any period for which the person receives credit under any other public employee retirement system, unless the credit under that other retirement system has been irrevocably relinquished.
40 ILCS 5/13-403