Multiple rocket launcher
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A multiple rocket launcher (MRL) is a type of unguided rocket artillery system. Like other rocket artillery, MRLs are less accurate and have a much lower rate of fire than batteries of traditional artillery guns. However, they have the capability of simultaneously dropping many hundreds of kilograms of explosive, with devastating effect.
The earliest model is probably the Hwacha used by Koreans, first deployed in 1451. It consisted of small rockets attached to arrows which flung spikes upon detonation. The Hwacha was basically a primitive fragmentation weapon.
The most famous multiple rocket launchers are the Katyushas, known also as Stalin Organs, first used by the Soviet Union during World War II and by its allies during the Cold War. They were simple systems in which a rack of launch rails were mounted on the back of a truck. In the same conflict Germany and Britain produced towed rocket systems known as the Nebelwerfer and Land Mattress respectively. Modern systems are often mounted on armoured, tracked vehicles, have a range of tens of kilometers, and may be guided for accuracy.
The U.S. Army's M270 MLRS (Multiple Launch Rocket System) is an example of a modern system, also in service with several other nations.
The Indian Army uses the Pinaka Multi Barrel Rocket System;
The Brazilian Army uses the Astros II MLRS.
The Russian Ground Forces use the BM-14, BM-21, BM-27, and BM-30 among others.
The Sri Lanka Army uses RM-70 and BM-21.
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the first multiple missile launcher was developed in china.