If, at any time since first becoming a member of the retirement system, a member has served in the armed forces of the United States, in any war or period of armed hostilities between the armed forces of the United States and those of a foreign power, and is subsequently reinstated as a fireman within ninety days after his discharge, he shall be granted credit for such service as if his service in the fire department of the city had not been interrupted by his induction into the armed forces of the United States, and as if he had made the required contributions during such service. If earnable compensation is needed for such period in computation of benefits it shall be calculated on the basis of the compensation payable to the officers of his rank during the period of his absence.

(L. 1959 S.B. 314 § 86.520)