The T30 was developed in close relation to the T29 Super Heavy Tank. It featured the same chassis and turret, but with a slightly different engine deck for a more powerful engine. It was initially intended for use against newly fielded German heavy tanks, such as the Tiger II, as well against fortifications in 1945. Development started around April 1945, however, this turned out to be towards the end of the war in Europe, so the whole heavy tank project was suspended in favor of Main Battle Tanks (MBTs). The T30 and the rest of the project (The T29 and T34 Heavy Tanks) never saw action in the war, however, they proved to be helpful in future developments.