(a) In lieu of state and city automobile tags, each active member of the Arkansas Army National Guard and the Air National Guard shall be required to affix to their respective automobile or pick-up truck, if used as personal conveyance and not used for commercial purposes, a regulation tag to be supplied by the Adjutant General bearing a serial number and a National Guard designation.
(b) They shall likewise be exempt from the payment of any road tax and from any road duty whatsoever under the laws of this state.