During the early years of World War II, Japanese Americans were forcibly relocated from their homes in the West Coast 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 Marine. An estimated 33,000 Japanese Americans served in the U.S. military during World War II, of which 20,000 joined the Army. Approximately 800 were killed in action. The 100th/442nd Infantry Regiment became the most decorated unit in U.S. military history. The related 522nd Field Artillery Battalion liberated one or more subcamps of the infamous Dachau concentration camp. Other Japanese-American units also included the 100th Infantry Battalion, the Varsity Victory Volunteers, and the Military Intelligence Service. Servicemen in the U.S. Army The majority of Japanese Americans serving in the American Armed Forces during World War II enlisted in the army. 100th Infantry Battalion The 100th Infantry Battalion was engaged in heavy action during the war taking part in multiple campaigns. The 100th was made up of Nisei who were originally members of the Hawaii National Guard. Sent to the mainland as the Hawaii Provisional Infantry Battalion on June 5, 1942, the 1,432 original members of the 100th were stationed first at Camp McCoy and later at Camp Shelby for combat training. Their exemplary military record, and the patriotic activities of the Varsity Victory Volunteers, paved the way for the creation of the 442nd Regimental Combat Team in January 1943. The Battalion shipped out in August 1943, landing in North Africa before fighting in Italy, eventually participating in the liberation of Rome. 442nd Regimental Combat Team Meanwhile, an earlier decision to demote Nisei soldiers to 4-C class (enemy aliens ineligible for military service because of nationality) was reversed, and the Army in January 1943 issued a call for Japanese-American volunteers. Most of the initial recruits came from Hawaii, as those on the mainland were reluctant to volunteer while they and their families remained in camp. The 2,686 accepted Hawaiians (out of 10,000 volunteers) and about 1,000 mainlanders were sent to Camp Shelby. The U.S. Army regiment served in Europe during World War II. Japanese Americans already in training at the start of