(1) Any member of the retirement system for judges may purchase, subject to the provisions of Kan. Stat. Ann. § 74-49,123, and amendments thereto, participating credit for periods of active service in the armed forces of the United States or in the commissioned corps of the United States public health service and for periods of service required to fulfill the requirements of section 651 of title 10, United States code, which does not exceed six years. Such judge shall be entitled to purchase one quarter of participating service credit for each year of service required to fulfill the requirements of section 651 of title 10, United States code. Such purchase shall be effected by the judge submitting proof of such service acceptable to the board and electing in writing to have employee contributions as provided in Kan. Stat. Ann. § 20-2603, and amendments thereto, deducted from such judge’s compensation at an additional rate of contribution, in addition to the employee’s rate of contribution as provided in Kan. Stat. Ann. § 20-2603, and amendments thereto, based upon the judge’s attained age at the time of purchase and using actuarial assumptions and tables in use by the retirement system at such time of purchase for such periods of service. Such additional rate of contribution shall commence at the beginning of the quarter following such election and shall remain in effect until all of the full quarters of such service have been purchased.

(2) Any member of the retirement system who has not retired may purchase, subject to the provisions of Kan. Stat. Ann. § 74-49,123, and amendments thereto, participating service credit for military service as described in this section by electing to effect such purchase by means of a single lump-sum payment in lieu of employee contributions as provided in this section. The lump-sum payment shall be an amount determined by the actuary using the judge’s then current annual rate of compensation or the judge’s final average salary at the time the judge elects to purchase such service credit, whichever is higher, the actuarial assumptions and tables currently in use by the retirement system and the judge’s attained age.