The county veterans' service officer must be paid such monthly salary for full-time or part-time work as the board of county commissioners deems commensurate with the needs of the situation, together with actual living expenses when absent from the officer's established office upon official business in an amount not exceeding that allowed to state officials, upon itemized statements submitted by the officer and supported by sub vouchers or receipts as provided by section 21-05-01 and the officer's actual transportation expenses, which may not exceed the amounts provided by section 54-06-09, and must be in itemized form showing the mileage traveled, the days when and how traveled, and the purpose thereof, verified by the officer's affidavit and supported by sub vouchers or receipts as provided by section 21-05-01.