442nd Infantry Regiment (United States) Active 1944-1946 Size ~4000 Nickname(s) Purple Heart Battalion belongs to the 100th Infantry Battalion (Separate) Motto(s) "Go for Broke" Colors Blue and White The regiment is best known as the most decorated in U.S. military history and as a fighting unit composed almost entirely of second-generation American soldiers of Japanese ancestry (Nisei) who fought in World War II.