15.1. An employee who while employed by the City entered any armed service of the United States, or a member who entered or enters any armed service of the United States, and who has been or shall be on active duty during time of war or period of compulsory military service shall have such armed service credited him as City service in the same manner as if he had served the City uninterruptedly; provided, that (1) he shall have been or shall be re-employed by the City as an employee within one year from and after termination of such armed service actually required of him, (2) he returned to the employees’ savings fund the amount, if any, he withdrew therefrom at the time he entered or while in such armed service, together with regular interest from the date of withdrawal to the date of repayment, and (3) in no case shall more than 5 years of City service be credited any member for all such armed service rendered by him. In any case of doubt as to the period of service to be so credited any member the Retirement Board shall have final power to determine such period. During the period of such armed service and until his re-employment by the City his contributions to the Retirement Plan shall be suspended and his balance in the employees’ savings fund shall be accumulated at regular interest.