The MLRS rocket projector component was used to devastating effect by the armies of World War 2 and remains a prominent battlefield piece today.
MLRS (Multiple Launch Rocket System) is a tracked or wheeled vehicle mounting a rocket launching (projecting) system atop its hull. In this configuration, the MLRS projects unguided rockets against enemy positions in an artillery-minded sense. The MLRS offers a devastating physical and psychological effect on the enemy, capped with high explosive, anti--personnel or chemical warheads as needed. The best known MLRS development is the timeless BM-13 'Katyusha' wheeled system of the Soviet Union used during World War 2, seeing widespread exportation to its allies in the years following. The Western modern equivalent is the American M270 MLRS. Systems on order (heading into the new year) are not taken into account.