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
Japanese American service in World War II Japanese American service in World War II During the early years of World War II, Japanese Americans were forcibly relocated from their homes in the Pacific Coast states because military leaders and public opinion combined to fan unproven fears of sabotage. As the war progressed, many of the young "Nisei", Japanese immigrants' children who were born with American citizenship, volunteered or were drafted to serve in the United States military. Japanese Americans served in all the branches of the United States Armed Forces, including the United States Merchant Marines. The 442nd Infantry Regiment became the most decorated unit in U.S.