What Native American tribe in association with the US Marine Corps created an unbreakable code that was used in messages of military intelligence in the Pacific Theater of World War 2?

The Navajo Nation is the Native American tribe that collaborated with the US Marine Corps to create an unbreakable code during World War II. Navajo code talkers developed a complex code based on their native language, which was used to transmit crucial military messages in the Pacific Theater. The code proved to be highly effective, as it was never broken by enemy forces and played a significant role in the success of US operations.