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The M60A2, nicknamed the “Starship“ due to its space-aged technology, featured an entirely new low-profile turret with a commander's machine-gun cupola on top, giving the commander a good view and field of fire while under armor but spoiling the low profile. It also featured a 152 mm caliber main gun similar to that of the M551 Sheridan light tank, which fired regular rounds as well as the Shillelagh anti-tank guided missile (ATGM). The fitting of a CBSS (closed breech scavenger system) which used pressurized air to clear the breech after each shot solved some problems such as unburnt propellant from the main gun rounds fouling the barrel and pre-detonating subsequent rounds. The M60A2 proved a disappointment, though technical advancements would pave the way for future tanks. The Shillelagh/M60A2 system was phased out from active units by 1981, and the turrets scrapped. Most of the M60A2 tanks were rebuilt as M60A3, or the hulls converted to armored vehicle-launched bridge (AVLB) vehicles
