As young marines, Peter MacDonald and Thomas Begay transmitted top secret military messages using their native language. It was an undercover mission that changed U.S. intelligence operations forever.

SEVEN NEWS. THEY PLAYED A CRUCIAL ROLE DURING WORLD WAR TWO, AND NOW ONLY TWO NAVAJO CODE TALKERS ARE STILL ALIVE. AS WE CELEBRATE NATIVE AMERICAN HERITAGE MONTH. SASHA LENNINGER INTRODUCES US TO ONE ...