(b) In computing service, credit shall be given for all leaves of absence subject to the limitations specified in the following paragraph during the time an employee was engaged in the military or naval service of the United States of America during the years 1914 to 1919, inclusive, or between September 16, 1940, and July 25, 1947, or between June 25, 1950, and January 31, 1955, and any such service rendered after January 31, 1955, and who within 180 days subsequent to the completion of military or naval service re-enters the service of the employer. The total credit any employee shall receive for military or naval service during the entire term of service as an employee shall be subject to the following conditions and limitations:
(1) if entry into military or naval service occurs after July 1, 1961, the total credit shall not exceed 3 years;(2) if entry into military or naval service occurred on or prior to July 1, 1961, the total credit shall not exceed 5 years;(3) an employee who on July 1, 1961, had accrued more than 5 years of such military or naval service shall be entitled to the total amount of such accrued credit. The contributions an employee would have made during the period of such military or naval service, together with the prescribed employer contributions, shall be made by the employer and shall be based on the salary for the position occupied by the employee on the date of commencement of the leave of absence.
(g) A contributing employee may establish additional service credit for a period of up to 5 years of employment by the United States federal government for which he or she does not qualify for credit under any other provision of this Article, provided that (1) the amount of service credit established by the person under this subsection (g), when added to the amount of all military service credit granted to the person under subsections (b) and (f), shall not exceed 5 years, and (2) any credit received for the federal employment in any other public pension fund or retirement system has been terminated or relinquished. In order to establish service credit under this subsection (g), the applicant must submit a written application to the Fund, including such documentation of the federal employment as the Board may require, and pay to the Fund (1) 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 federal service, or on the first date as a participating employee after the federal service, whichever is greater, plus (2) an amount determined by the Board to be equal to the employer's normal cost of the benefits accrued for such federal service, plus (3) regular interest on items (1) and (2) from the date of conclusion of the federal service to the date of payment. Contributions must be paid in a single lump sum before the credit is granted. Credit established under this subsection may be used for pension purposes only.