Many Japanese Americans served with great distinction during World War II in the American forces. The 442nd Regimental Combat Team/100th Infantry Battalion is one of the most highly decorated unit in U.S. military history. Composed of Japanese Americans, the 442nd/100th fought valiantly in the European Theater. The 522nd Nisei Field Artillery Battalion was one of the first units to liberate the prisoners of the Nazi concentration camp at Dachau. Hawaiʻi Senator Daniel K. Inouye is a veteran of the 442nd. Additionally the Military Intelligence Service consisted of Japanese Americans who served in the Pacific Front.
http://en.wikipedia.org/wiki/Japanese_Americans 21 Medals of Honor (the first awarded posthumously to PFC Sadao Munemori, Company A, 100th Battalion, for action near Seravezza, Italy, on April 5, 1945; the others upgraded from other awards in June 2000).
http://en.wikipedia.org/wiki/442nd_Regimental_Combat_Team#Decorations