All expenditures of funds for the maintenance and operation of the national guard and the office of the adjutant general must be made upon vouchers signed and approved by the adjutant general or such other officer or official as may be designated by the adjutant general. Upon approval of such vouchers by the office of the budget, warrant-checks must be prepared by the office of management and budget for signature by the state auditor and state treasurer in accordance with such approved vouchers.