AAA battalions were also used to help suppress ground targets. Their larger 90 mm M3 gun would prove, as did the eighty-eight, to make an excellent anti-tank gun as well, and was widely used late in the war in this role. Also available to the Americans at the start of the war was the 120 mm M1 gun "stratosphere gun", which was the most powerful AA gun with an impressive altitude capability, however no 120 M1 was ever fired at an enemy aircraft. The 90  mm and 120  mm guns would continue to be used into the 1950s.