Miss. Code Ann. § 33-1-25

All units of the military forces of the state shall have the right of way over all other traffic except emergency vehicles and vehicles carrying the United States mail when travelling over any street or highway of this state. All members of the military forces of this state and the vehicles occupied by them shall be allowed to pass free through all toll gates and over all bridges and ferries when performing any military duties or going to or returning from any place set for the performance of such duties.