In my opinion it would be the Navajo code talkers. Their language was kept within the small amount of Navajo's so it was very unknown to the majority of the people including the enemies of the U.S. military. They had large success in the war and fought with a lot of courage and bravery.
The Navajo.
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Native American code talkers... the Navajo code talkers recruited by the Marines during the Second World War are the most famous of them, although the Army did recruit some Cherokee, Choctaw, and and Comanche code talkers. Additionally, the Marines hired some native Basque speakers for the same purpose. The "code" they spoke was actually their native language.
A lot of code talkers were killed off because when the Japanese saw them in the planes, they would kill the code talkers right away because the code talkers were the main source of communication.
"Code Talkers" by Joseph Bruchac is a historical fiction novel that follows the story of two Navajo men during WWII, Ned Begay and Sam Billison, who serve as code talkers. The primary characters in the book are Ned Begay, the protagonist, and the other Navajo code talkers who played a crucial role in transmitting secure messages in their native language to help the US military.
In US Marine uniforms.
The Navajo Code Talkers were in the Armed Forces and were paid according to their pay status and rank. The Navajos that remained in the US and were too old to join the military and helped with the code were reimbursed.
That the Navajos helped thge US in the war.
You can trust the information of the book Code Talkers by Joseph Bruchac. It is published by Penguin Books which is a 5 star rated publishing company. They check the reliability of the information in the book prior to publishing the book. He interviewed both code talkers from the Navajo tribe and the US Military. He is a historian and has many reliable books to his credit. The Navajo Tribal Council can let you know if there are errors in the book. I know of none.
The "bodyguards" for the Navajo Code Talkers had the responsibility to see that they never fell into Japanese hands. This responsibility was handled in two ways:protect the Navajo Code Talker during battlekill the Navajo Code Talker if he was captured or was about to be captured by Japanese (the Navajo Code Talkers were never informed of this)Effectively the US Military treated the Navajo Code Talkers as they would any other classified high security cypher machine they might use to send and receive secret messages. If you were responsible for a cypher machine your responsibilities for handling the machine were identical: protect it from the enemy in battle and destroy it should there be a chance of the enemy capturing it.
The Navajo Code Talkers took part in, and contributed to the success of, the island campaigns in the south and central Pacific between the US and Japan.
Navajo as code talkers