Whenever any part of the unorganized militia is ordered out for active military service, or other service which may be necessary in the discretion of the Governor, it shall be governed by the same rules and regulations, and be subject to the same penalties, as the National Guard or Naval Militia. The Governor, in his discretion, may appoint and commission emergency officers in the state militia at any time. Such commissions shall expire at the end of five years from the effective date thereof.