The development of weapons technology accelerated in the years between 1939 and 1945 to an extent never before seen. This was because the countries involved in World War II needed to harness their full scientific and industrial know-how in the design and production of weapons. In 1939, for example, most tanks were fitted with Carmon of 40 nun calibre or less and weighed more than 15 tons, whereas in 1945 heavy tanks of up to 70 tons were fitted with weapons of calibres of up to 126 tons. Here you'll find a comprehensive overview of the progress of weapons technology during World War II, featuring the significant weapons and vehicles used by the Axis and Allied nations.