Heavy tank
The Char 2C was one of the largest tanks ever produced. At the start of World War II, France and the Soviet Union were the only countries to have inventories of heavy tanks, such as the Char B1, T-35, and KV-1. The Matilda II was designed under the British infantry tank concept which is similar to the heavy tank having thick armor and weighing more than their other tanks. It’s usually separate because they have less firepower with their cruiser tanks (comparable to mediums) at the time having the same main armament but more machine guns. Later war examples were the German Tiger I and II, as well as the Soviet IS series. Note that "heavy" versus "medium" is more a question of tactical roles than weight; the Panther, for example, was a "medium" tank that outweighed most Allied "heavy" tanks.
4th Tank Battalion
Between November 1990 and January 1991, 4th Tank Battalion was mobilized in support of Operation Desert Shield and Operation Desert Storm. Elements of the battalion were "in country" and combat ready within 32 days of activation. During the fighting, Bravo Company engaged Iraqi tanks in combat on February 25, reporting 34 enemy tanks destroyed or disabled in less than 90 seconds. This battle was named the “Reveille Engagement” and went on to be the biggest and fastest tank battle in United States Marine Corps history. They were the only Marine unit equipped with M1A1 Abrams tanks. Bravo company went on to destroy 59 tanks, 32 APCs, 26 non armored vehicles, and an artillery gun. Bravo Company destroyed a total of 119 enemy vehicles and took over 800 POWs. Tank crew “Stepchild” has the longest confirmed live kill (Iraqi BMP) by a tank at 3,750 meters (2.33miles).