The M270 Multiple Launch Rocket System (M270 MLRS) is an American-developed armored, self-propelled, multiple rocket launcher. The U.S. Army variant of the MLRS vehicle is based on the chassis of the Bradley Fighting Vehicle. The first M270s were delivered in 1983. The MLRS were subsequently adopted by several NATO countries and other countries. The MLRS first saw service with the United States in the 1991 Gulf War. The MLRS has been upgraded to fire guided missiles, and has been used by Ukraine in the 2022 Russian invasion of Ukraine. Description Background In the early 1970s, the Soviet Union had a clear advantage over U.S. and NATO forces in terms of rocket artillery. Soviet tactics of bombardment by large numbers of truck-mounted multiple rocket launchers (MRLs), such as the BM-21, would saturate a target area with thousands of rockets, ensuring some would hit specific targets while delivering a psychological impact. By contrast, U.S. artillerists favored cannon artillery for its relative accuracy and ammunition conservation over "area fire" rockets, and as a result were left with only a small amount of World War II vintage rocket artillery. This mindset began to change following the 1973 Yom Kippur War, which saw high loss rates, especially from rear-area weapons like surface-to-air missiles (SAMs), as well as the effective Israeli tactic of hitting such sites with MRLs. This combined with the realization that such an experience would happen on a larger scale in the event of war in Europe. It would be used to engage enemy air defenses and for counterbattery fire, freeing cannon units to provide close support for ground forces. The MLRS was conceived as the General Support Rocket System (GSRS). In December 1975, the U.S. Army Missile Command issued a request for proposal to industry to assist in determining the best technical approach for the GSRS. In March 1976, the Army awarded contracts to Boeing, Emerson Electric, Martin Marietta, Northrop and Vought to explore the concept definition of the GSRS. In September 1977, Boeing Aerospace and Vought were awarded contracts to develop prototypes of the GSRS. In 1978, the U.S. Army Aviation and Missile Command made changes to the program so that the GSRS could be manufactured in Europe. This was to allow European nations, who had been independently pursuing their own MLRS programs, to buy in to the program. In July 1979, the United States, West Germany, France and the United