The M48A3 'Patton' was the main battle tank for armoured units of the US Army during the Vietnam era. The A3 version tanks were originally built as standard M48s, but got their less-reliable gasoline engines replaced by diesel engines. The first 600 M48A3s came into US Army service in early 1963, making them look rather modern, when Goldfinger was filmed. The tank was named after George S. Patton (1885-1945) a famous WW2 American General, as were some previous tank models.
Although they were not directly involved in any action sequences, several M48A3s can be seen parked at Fort Knox, when Pussy Galore and her flying circus spray their nerve gas onto the soldiers.