The multiple rocket launcher, developed by the Russians before World War II as a cheap alternative to massed artillery fire by individual guns. Long seen as a supplement to regular artillery, the introduction of the high tech U.S. MLRS rocket system in the 1980s began to make a lot of conventional artillery obsolete. Of course, artillery has always been ripe for innovation. The U.S. 175mm gun, introduced in the 1960s, was rendered obsolete in the 1980s with the introduction of special long range ammo for the 203mm (8 inch) howitzer. When the MLRS  entered service, one of the three batteries in each division's 203mm howitzer battalion was equipped with MLRS units instead. But MLRS proved so effective that the 203mm howitzer battalion became an MLRS battalion. There were always non-divisional MLRS battalions, as the MLRS was seen, from the beginning, as an ideal weapon for massed artillery fire. The Gulf War allowed the MLRS to show off what a potent weapon it could be. The larger rockets also provided room for more complex payloads (cluster and "smart" munitions) and guidance systems. This was another example of how technology can transform an old weapon. While the Russians have been using rocket launchers for over 60 years, they never got around to enhancing their effectiveness with a lot of technology.