Hell to Eternity (1960)

True-life story of Guy Gabaldon, a Los Angeles Hispanic boy raised in the 1930s by a Japanese-American foster family. Later, during the war, as his foster parents are interned at a camp for Japanese Americans, Gabaldon's ability to speak Japanese helps him become a lone-operating Marine hero. During the bloody capture of the island of Saipan, he convinces 800 Japanese to surrender after their general commits suicide.