During World War II, Navajo soldiers contributed one of the conflict's most vital yet least publicized achievements by weaving their native language into an unbreakable code. Via interviews with surviving code talkers, this History Channel documentary sheds light on the Navajo troops' role, valor and motivations. The program also details their legacy's effect on contemporary Navajo and how the cipher has aided the United States since the war.

In the 1940s, twenty-nine young men from government-run Navajo reservations bravely heeded the call of a nation, which once nearly wiped out their ancestors and the memory of their culture completely.

During the second world war, the United States and its allies were struggling to find a code by which to communicate across the Pacific Ocean - one that could not be broken by the Japanese enemy. The solution came in the form of the Navajo people, whose language was as elusive as it was complex. Through their incredible linguistic skills, the Allied forces were able to convey life-or-death information to one another - information that, in some cases, altered the very course of the war.

In this eye-opening documentary, renowned historians and several Navajo veterans relate how a mere handful of WWII marines devised the only unbreakable code in modern military history.