Key Points – The M103, America’s last heavy tank, was developed in the 1950s as a direct response to formidable Soviet heavy tanks like the IS-3. Built with exceptionally thick armor and a ...

The M103 is a heavy tank, a classification of vehicle that includes tanks that were produced during World War I and continued to be used through the Cold War.

Heavy tanks such as the United States' M103 (pictured here), though formidable, could be unwieldy, ... Object 279, at around 60 tons in weight, absolutely put the heavy in heavy tank.

Type: Light two-man combat tank Year entered service: 1918 Top speed: 5.5 mph Crew size: 2 Armament: 37mm cannon, 7.62mm machine gun 19. M103 ...