The 442nd Regimental Combat Team was formed officially in February 1943. It was made up of Nisei volunteers from Hawaii and the mainland. The RCT was composed of the following units:

·         442nd Headquarters Company

·         Anti-tank Company

·         Cannon Company

·         Medical Detachment

·         Service Company

·         100th Infantry Battalion – Companies HQ, A, B, C, D The existing 100th Infantry Battalion formed of Nisei volunteers in Hawaii in May 1942 was incorporated into the 442nd RCT in June 1944 when they joined forces in Europe. They retained their name because of their distinguished combat record in North Africa in June 1943 and in Italy in September 1943.

·         2nd Battalion – Companies E, F, G, H

·         3td Battalion – Companies I, J, K, M

·         522nd Field Artillery Battalion – Companies A, B, C

·         206th Army Band

·         232nd Engineering Company

The 100th/442nd RCT became the most decorated unit in U.S. military history for its size and length of service. There were over 9,000 Purple Hearts, seven Presidential Distinguished Unit Citations, and over 18,000 individual decorations for bravery including twenty Congressional Medals of Honor, nineteen of which were upgraded from Distinguished Service Crosses in June 2000