The M-84 is a main battle tank used by the Croatian, Serbian, and Slovenian armies. It was developed in Yugoslavia, entering service with the army of this country in 1985. Armed with a 125mm 2A46 smooth-bore gun, the M-84 is a good tank; it is protected by composite armor composed of an alloy of extra-hardened steel and tungsten, plus a layer of plastic filler with ceramic component. The M-84 is powered by a V-46TK diesel engine that produces 1,000 hp. It has a maximum speed of 68 km per hour (42mph) and an operational range of 700 km. It weighs 42 tons and is 9.5 m in length and 3.57 m in width. Purchased by the army of Kuwait, it saw combat action during the Gulf War in 1991, proving its superiority over the T-55 and T-72 tanks used by the Iraqi army. More than 650 M-84 main battle tanks have been built in different versions, such as the M-84A, M-84AB, and M-84AS.