The M1 Abrams main battle tank entered Army service in 1980, after replacing the M60 tank. and is considered one of the best heavy combat vehicles in the U.S Army fleet. With advance amour, it excels in battlefield by outstanding mobility and strong firepower Three next generationsversions of the tank have been also deployed in service: M1, M1A1 and M1A2. This tank is designated for attacking against vast armor forces on battlefield. The advance variant of the M1, the M1A1 has presented significant improvements in its armament as well as improved suspension system. In addition, major modernization has been made for the armor protection along with NBC protection system for increased survivability in contaminated environment. These improvements, which also included periodic upgrading for older M1 battle tanks, has allowed to remain in service at the front line on battlefield.