Section 5. Section 13(b) of the act, amended July 20, 1979 (P.L.164, No.53), is amended to read:
Section 13. Credit for Military Service; Payments into Fund; Reimbursement.--* * *
(b) With the approval of the county retirement board, all members of the fund who are contributors and who served actively in the armed forces of the United States [subsequent to September 1, 1940, and who were not members of the fund prior to such military service,] shall be entitled to have full service credit for each year or fraction thereof, not to exceed five years of such service. The amount due for the purchase of credit for military service other than intervening military service shall be determined by applying [the employe's basic contribution rate plus the county's normal contribution rate for active members at the time of entry, subsequent to such military service, of the employe into county service] an employe's contribution rate of five per cent plus a county contribution rate of five per cent to his average annual rate of compensation over the first three years of [such subsequent county] credited membership service and multiplying the result by the number of years and fractional part of a year of creditable nonintervening military service being purchased together with regular interest [during all periods of subsequent county] from the commencement of such credited membership service to date of purchase. Said contributions shall be paid into the fund by the employe: Provided, That the member has three years of county service subsequent to such military service: Provided further, That he is not entitled to receive, eligible to receive now or in the future, or is receiving retirement benefits for such service under a retirement system administered and wholly or partially paid for by any other governmental agency.