The 100th Infantry Battalion was formed after the attack on Pearl Harbor, during a period of turmoil and fear in the Territory of Hawai‘i. The 100th was made up almost entirely of Nisei, second generation Americans of Japanese Ancestry (AJAs), who had learned traditional Japanese values at home and American principles of democracy at school. Young Nisei men had demonstrated their willingness to serve their country well before the attack, comprising nearly half of the 298th and 299th Infantry Regiments of the Hawai‘i National Guard.
In May 1942, the War Department ordered the formation of the segregated Hawaiian Provisional Battalion by transferring Nisei from the 298th, 299th and several engineer battalions based at Schofield Barracks. A month later these 1,432 Nisei sailed from Honolulu for California to form the 100th Infantry Battalion (Separate) (which indicated it was unattached to a larger army unit). Reflecting on their local roots, the soldiers soon adopted the unit nickname “One Puka Puka”. After over a year of intense training at Camp McCoy, Wisconsin and Camp Shelby, Mississippi, the 100th had become one of the best prepared units in the Army and would live up to its motto to “Remember Pearl Harbor”.
Landing in North Africa on September 1943, the unit fought valiantly in the Allied forces’ drive to Rome, the brutal battle of Monte Cassino, and the breakout from the Anzio beachhead. The battle for Mont Cassino marked the end of the original 100th Battalion - by February 1944, the 100th had suffered nearly 800 wounded and killed in action and was nicknamed “The Purple Heart Battalion”. Following Cassino, the 100th began receiving replacements from the 442nd RCT and in June 1944, the 100th became part of the 442nd RCT.
For more information please visit the 100th Infantry Battalion Veterans Education Center