American military technology during World War II US cruisers and battleships had their guns directed using information gathered from the ship's radar. 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,
Japanese tanks of World War II Type 97 Chi-Ha with a 57 mm Model 97 gun; and the Type 5 Ho-Ru, a prototype casemate-hulled turretless self-propelled gun similar to the German Hetzer, but with a Type 1 47 mm tank gun. The was the most widely produced Japanese medium tank of World War II, with about 25 mm thick armor on its turret sides, and 30 mm on its gun shield, considered average protection in the 1930s. Some 3,000 units were produced by Mitsubishi, including several types of specialized tanks. Initial versions were armed with a low-velocity Type 97 57 mm tank gun that was designed