via Military Update M270 MLRS: The Killer Weapon Russia Feared Most The Multiple Launch Rocket System (MLRS), formerly known as the General Support Rocket System (GSRS), is designed to supplement cannon weapons available to U.S. Army division and corps commanders for the delivery of a large volume of firepower in a very short time against critical, time-sensitive targets. The MLRS is a high-mobility automatic system based on an M270 weapons platform. The MLRS is capable of supporting and delivering all free-flight basic and extended-range rockets and the Army Tactical Missile System Block I missiles.