Final answer:
The Navajo Code Talkers played a crucial role in World War II by utilizing their native language to send coded messages that were vital for secure and efficient communication on the battlefield.
Step-by-step explanation:
The Navajo Code Talkers played a crucial role in World War II as members of the United States Marine Corps. They used their indigenous language to send coded messages that only Navajo speakers could decipher, providing secure and efficient communication on the battlefield. Their contributions were highly valuable and their ability to speak directly with each other without using encryption machines gave US commanders the advantage of nearly instant communication, without the fear of the enemy intercepting their messages.