This is a very cool video.
Apparently, there was code translating machines but they weren’t that fast. The “telegraphic” code words in the unwritten Navajo language, with their memorized meanings, meant that coms were very fast.
During WWI the Choctaw language was used for tactical messages. Meanwhile, Japan and Germany had sent people to these USA to study native languages! However, there was Navajo, which is really complicated.
400 Navajo were in the Code Talker program, in all 6 Marine Divisions. The Japanese had cracked the codes for the Army and Army Air Corps, but not the Marines. There was even a Navajo captured by the Japanese, but he couldn’t make it out.
Code Talkers were at Guadalcanal, Tarawa, Pelilieu and Iwo Jima. Major Howard Connor, signal officer of the Navajos at Iwo Jima, said, “Were it not for the Navajos, the Marines would never have taken Iwo Jima.”
More at the Naval History and Heritage Command. HERE