Chester Nez was barely out of his teens when he joined the Marines in a role that would help the United States and its allies win World War II, a role that stayed secret for decades.

Nez was one of 29 members of the Navajo tribe that developed a military communications code based on the Navajo language. It was that same language that Nez and his friends were forbidden to speak when they were students at government-run boarding schools for Native American children.