In Vietnam, US Army/Marine Corps M48 Patton medium tanks were built from solid cast/wielded steel (no rivets and no plates). The brand new M551 Sheridan tanks had aluminum hulls and steel turrets and...
This question is incorrectly categorized as WW2. Tanks first saw action in WW1, developed by the British forces. The idea apparently was from E.D. Swanton, who thought about armoring Holt tractor so...