Follow the return of six Navajo Code Talkers to the five Pacific Island sites where their unbreakable secret code, based on the unwritten Navajo language, helped U.S. forces overcome Japanese expansion in the Pacific Theater during World War II. The code was never broken. The highly personal reflections of the Navajo Code Talkers dominate the film's storyline, where they share personal accounts, memories, and insights into their war experience. Interviews were conducted on Guam, Saipan, Tinian, Iwo Jima, and Okinawa and USMC Camp Pendleton, north of San Diego, where they trained, learned, and enhanced the original code.