NHSP patrol vehicles have unique "State Police" license plates, with plate numbers corresponding to the troop the vehicle is assigned to. 100 series plates belong to A troop, 200 to B troop, 300 to C troop, 400 to D troop 500 to E troop, 600 to F troop, 700 to G troop and 800 for probationary troopers, and 900 for spare cruisers and other equipment. Single and double digit plates are assigned to headquarters as command and special assignments. When a trooper completes a probationary year with the division, he or she is issued permanent plates for their patrol vehicle.