"At Iwo Jima, the Code Talkers immortalized themselves. To capture the island, the entire military operation was directed by orders communicated by the Navajo Code Talkers. During the first forty-eight hours, while the marines landed and consolidated their shore positions, six Navajo radio nets operated around the clock. They sent and received more than 800 messages without error. When the marines raised the flag on Mount Suribachi, the Code Talkers relayed the message in the Navajo code: "sheep-uncle-ram-ice-bear-ant-cat-horse-itch."
The Japanese were unable to break their code, during the whole duration of that time, as indicated. Was a language they did not recognize.