(iii) for all continuous employment with the same employer other than either as policeman or fireman, immediately preceding such service as a policeman or fireman, one month of credit for each two months of service. Any member or retirant who has been credited with prior service as provided in this section may apply to the board on such forms as the board prescribes for prior service credit with a participating employer under the Kansas police and firemen's retirement system other than such member's entry date employer. Each member shall receive full credit for all employment as either a policeman or fireman with such other participating employers and shall receive one month of credit for each two months of continuous service with other participating employers for continuous employment preceding service as a policeman or fireman. Upon receipt of written verification of such employment from such other participating employer, the board may grant such additional prior service credit. With respect to a retirant, the board shall adjust the amount of the retirement benefit accordingly commencing with the next monthly benefit payment due following receipt of written verification. In the case of any person other than a retirant receiving a retirement benefit, such person may make application for an adjustment in the benefit amount in the same manner as a member or retirant, and in such case the adjustment in the benefit amount shall be determined by the board upon the advice of the actuary, and shall commence with the next monthly benefit payment due following receipt of written verification, except that no additional prior service credit shall be granted for any service with another participating employer for which benefits are being received or will be received. A retirant or any other person receiving a retirement benefit shall not be entitled to any retroactive adjustment in the amount of retirement benefit as a result of the board granting such additional prior service credit. If a member was employed as a fireman, other than as a volunteer fireman, by a township which is annexed by a participating employer the member's retirement benefits and death and disability benefits shall be computed on the basis of credited service. Continuous service as a fireman with a township prior to annexation by a member, who became a member immediately following the annexation, shall be considered credited service.
No such service shall be considered credited service for the purpose of computing years of service if such fireman is receiving or will become eligible to receive benefits as a result of such service with the township.