The MAZ-543 is a specialist carrier vehicle which evolved into a vehicle used to carry numerous missile and rocket systems.
Several unfinished textures can be found in game files, indicating that it is cut early in development (t5_veh_truck_maz543_cab_n, t5_veh_truck_maz543_missile_n, t5_veh_truck_maz543_stuff_n.)
It can be seen in the level Iron Lady.
It makes an appearance in the Strike Force "Shipwreck" where they protect the SDC freighter docked in the Singaporean harbor from potential aerial or missile attack. Kraken is tasked with destroying one.