No person who honorably served in the military or naval service of the United States between January 1, 1917, and November 11, 1918, shall be required to pay the poll tax mentioned in the Constitution of Alabama prior to October 1, 1923; such persons shall be exempt from the payment of all poll taxes which have or may hereafter accrue prior to October 1, 1923. This section shall be self-executing and retroactive. The judges of probate shall issue certificates of exemption from the payment of such poll taxes to the persons entitled thereto under such rules and regulations as may be prescribed by the governor.