The Navajo code talkers were commended for their skill, speed, and accuracy demonstrated throughout the war. At the Battle of Iwo Jima, Major Howard Connor, 5th Marine Division signal officer, had six Navajo code talkers working around the clock during the first two days of the battle. These six sent and received over 800 messages, all without error. Connor later stated, "Were it not for the Navajos, the Marines would never have taken Iwo Jima."
As the war progressed, additional code words were added on and incorporated program-wide. In other instances, informal short-cut code words were devised for a particular campaign and not disseminated beyond the area of operation. To ensure a consistent use of code terminologies throughout the Pacific Theater, representative code talkers of each of the U.S. Marine divisions met in Hawaii to discuss shortcomings in the code, incorporate new terms into the system, and update their codebooks. These representatives in turn trained other code talkers who could not attend the meeting. For example, the Navajo word for buzzard, jeeshóóʼ, was used for bomber, while the code word used for submarine, béésh łóóʼ, meant iron fish in Navajo. The last of the original 29 Navajo code talkers who developed the code, Chester Nez, died on June 4, 2014.
The deployment of the Navajo code talkers continued through the Korean War and after, until it was ended early in the Vietnam War. The Navajo code is the only spoken military code never to have been deciphered.
And finally it was not a WWII thing ~ Code talking, however, was pioneered by Cherokee and Choctaw Indians during World War I.