(from ebookjapan):

The U.S. Army's 100th Battalion - commonly known as the Wampukapuka. Many boys who were students until recently were collected in this unit, which was formed solely by Second Generation Japanese living in Hawaii.

They do not fight for America. They were fighting to protect their pride as Nikkei, to protect their families in Hawaii, and to stay alive so they could step on the soil of their homeland. The 100th Battalion, finally out of ammunition and cornered by the Germans, fought to the death in an unprecedented battle at an old castle!