EVERY US army in WWII had its own set of codetalkers. Only the Marines had Navajo.<quoted text>Yes it was the Navajo, and it killed the Japanese that they could not break it.
Patton's codetalkers were Chickasaw natives.
The Japanese DID break part of it. They knew it was Navajo and actually had several Japanese who could understand it(they had lived in the SW USA). However, even if you knew Navajo, they had code words for all sorts of things so it didn't help.