American military technology during World War II American military technology during World War II American military technologies developed during World War II became more advanced and specialized as the war progressed. The technologies produced ranged in complexity from relatively simple items such as small arms and armored vehicles, including tanks, to more complex items such as the atomic bomb. The latter, produced under the secretive Manhattan Project, proved to be an incredibly powerful weapon that revolutionized warfare and was used to end the war. Other technologies, such as the M4 Sherman tank, the M1 Garand and M1 Carbine, and the gas mask, were refinements on previously existing
German tanks in World War II — High Command. In actual tank-on-tank encounters the German armor performed poorly, but as a coherent unit, the combined arms tactic of the Blitzkrieg shocked the Allies. The German Panzer forces at the start of World War II were not especially impressive. Only 4% of the defense budget was spent on armored fighting vehicle (AFV) production. Guderian had planned for two main tanks: the Panzer III, which was in production; and the Panzer IV with a 75 mm gun, which did not have one. The design work for the Panzer IV had begun in 1935 and trials of prototypes were