Only the Vietnam era M551 Sheridan light tank (officially designated the "Armored Airborne Reconnaissance Assault Vehicle" when it was first fielded in Vietnam in January 1969).
The Sheridan had a 152mm main gun, an alumimun hull, with foam flotation material imbedded into it's left and right sides. The Sheridan's turret & main gun were built of steel.
All other US tanks had to crawl along the bottom of water barriers, using snorkels to breath.
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the US Army invented the Sherman tank.
In 1950, the US Army redesignated tanks as 120mm Heavy Gun tanks, 90mm Medium Gun tanks, and 76mm Light Gun tanks. This was a change from the previous Heavy, Medium, and Light tanks, determined from the vehicle's weight. In 1960, with the advent of the new M60 Combat tank, and the deactivation of the Army's only Heavy Tank battalion (the M103 heavy tanks); the M60 series became MAIN BATTLE TANKS (MBT's).
During the early days of the Vietnam War, the French and allies were using left over tanks from WWII such as: the Japanese Type 95 light tank, and the US M24 Chaffee light tank. During the US Vietnam War, the following tanks were used: US: M48A3 Patton 90mm gun medium tank M551 Sheridan light tank 152mm gun (Armored Airborne Reconnaissance Assault Vehicle) Australia: Centurion 84mm gun medium tank ARVN (South Viet Army): M41 Walker Bulldog light tank NVA (North Viet Army): PT76 Amphibious light tank T-54/T-55 100mm gun medium tank
To smash thru the enemy's trenches (in WW1), without being stopped by machineguns (a bullet proof infantryman).
The British invented tanks in WWI; to breach the trenches. ========== Early drawings for a tank appear in the notebooks of Leonardo DaVinci.