The Navajo Code from World War Two: Was it Unbreakable?

The Navajo Code, which was used during the Second World War, has become one of the most famous military codes of all time. The code was developed in 1942 for use by the United States Marine Corps. This code was complex and sophisticated which made it perfect for military use. The Navajo Code’s complexity made it different from other Native American military codes used at the time or in World War I. The code was never broken but there was a close call during World War II. It achieved some important successes during the conflict, and became invaluable to the U.S. Marines and helped baffle the Japanese military.

Daniel Boustead explains.

Navajo code talkers. Saipan, Northern Mariana Islands, June 1944.

The Japanese Military had cracked every code the United States had used through 1942(1). The Marines in charge of communications were getting skittish([1]).  There was an imminent need for an unbreakable code!  Civil Engineer Philip Johnston, who had spent time on the Navajo Reservation came up with the idea of using the Navajo language (which was unwritten and understood only by those who lived with the Navajos) as the basis for an unbreakable code([2]).  Philip Johnston presented the idea to the U.S. Marine Corps ‘top brass’ and they decided to implement the idea right away(2). Communications officer Major James E. Jones, Major General Clayton B. Vogel (commander of Amphibious Corps, Pacific Fleet), and Commandant Thomas Holcomb were responsible for launching and recruiting the men who became code talkers(3). These men agreed on the need for the maximum secrecy of the program([3]). 

In February, 1942 at Camp Elliot, Vogel and Jones witnessed and ran a test experiment with Navajo men(3). This test experiment involved the Navajo men giving Navajo words to military terms in the period of an hour(3). Jones and Vogel also witnessed Navajo and Marine communications men transmitting several messages resembling in style and content the military messages that would be used in battle(3). At the time the standard used code was the “Shackle” code, which was written in English, encoded via a coding machine, and sent(3). Then the receiving end decoded the message, again via machine, and wrote it out English(3). It took an hour to transmit and receive the test messages using the “Shackle Code”(3). In contrast, when the same messages were transmitted and received in Navajo - with the Navajo men acting as human coding machines - it took only forty seconds for the information to be transmitted accurately(3). The test experiment was a success and Vogel agreed to launch a pilot, but due to the secrecy of the program it was decided to limit the trial program to 29 Navajo men(3). From  July 1942 to September 1942, 29 Navajo men from Platoon 382 helped invent and develop the Navajo Code([4]). The 29 Navajo men of Platoon 382 asked three Navajo speaking military men named Felix Yazzie, Ross Haskie, and Wilson Price to help them work on the Navajo Code([5]).  Navajo Code Talker Chester Nez said of the addition of  these three men “I don’t know why historians insist on separating them from the original twenty-nine. For me, it was the original thirty-two. They deserved credit for the code just as much as any of us did”(5). 

A unique code

The Navajo Code differed from other Native American Codes used in the past, in that the Navajo resisted adopting English words and folding them into the Navajo language like telephone and radio([6]).  The Navajo instead made up their own words for such inventions such as telephone and radio and thus keeping their language free from outside influence([7]). A person who is not Navajo finds it difficult to hear Navajo words properly, virtually impossible for him to reproduce the words, and nearly impossible to even pronounce even one word of Navajo if they are not used to hearing the sounds(6). Furthermore, as future Navajo Code Talker Sam Tso said “My language, my Navajo language, does not have an alphabet. we cannot write down our language, and we cannot read it. So, when they invented this code they used the English alphabet and they gave a certain word, to the ABC’s there and then as I looked at it and found out they have divided all those ABC’s according to the animals that lived in the water, travel on the water, that flew in the air, and those animals that live on the land. So, they divided into three parts”([8]). 

There were two types of Navajo code developed by the original Navajo Code Talkers(9). The first was the Type 1 code, which consisted of 26 Navajo terms that stood for individual English letters that could be used to spell out a word(9). For instance, the Navajo word for “ant”, in Navajo wo-la-chee, was used to represent the letter “a” in English([9].) Also, the original Navajo Code Talkers developed the Type 2 Navajo Code which contained words that could be translated from English into Navajo and included a dictionary (9).  For example, in the Type 2 Navajo Code there was no existing word for “submarine”, so the Navajo Code Talkers agreed to use the term besh-lo, which translates to “iron fish”(9).

In contrast, during World War I, Choctaw and Comanche soldiers transmitted messages in their complex language to stymie the Germans, which was by no means a code (6).The Choctaw and Comanche were used on a limited basis during World War I(6).  It was after World War I had ended that the Germans discovered which native languages had been employed by sending “tourists”, “scholars”, and “anthropologists” to learn the languages of various Native American tribes (6). Fortunately, the Navajo were not visited by these Germans spies(6). This prevented the secrets of the Navajo language from being passed on to Nazi Germany’s ally, Imperial Japan. This allowed the then secret language of Navajo to be used in developing an unbreakable code(6). Also, the Navajo Code contained 642 words or terms in their dictionary([10].)  By comparison the World War II-era Comanche Code Talkers only had 250 terms or 250 words and the primitive World War I era- Choctaw speaking experiment had only 20 terms or 20 words([11] ).  The Comanche Code Talkers served in Europe against the Third Reich ([12]).

Japanese code cracking efforts

A Japanese interrogator named Goon, interrogated a captured Navajo prisoner named Joe Kieyoomia (who had the survived the 1942 Bataan Death March) and came to the conclusion that the Code had something to do with the Navajo language([13]). Joe Kieyoomia, despite being brutally abused by his Japanese captors, never gave away any of the Navajo Code secrets(13). The Japanese Chief of Intelligence. Lieutenant General Seizo Arisue, said that while he was able to decipher the code used by the U.S. Army and the U.S.  Army Air Corps, he was never able to crack the Navajo Code ([14]). In the aftermath of World War II, the  Fuji Evening, a Tokyo newspaper, stated “If the Japanese Imperial Intelligence Team could have decoded the Navajo messages.. the history of the Pacific War might have turned out completely different”([15]). This shows the effectiveness in secrecy  surrounding the Navajo Code. 

The Navajo Code also had some important successes on the battlefields of the Pacific during World War II. During the Guadalcanal campaign, Navajo Code Talker Chester Nez and his friend Roy destroyed a Japanese machine gun position using the power of the Navajo Code to order an artillery strike to destroy it([16]). In the Battle of Iwo Jima, from February 1945 to March 1945, signal officer Major Howard Connor of the 5th Marine Division, said “Were it not for the Navajos, the Marines would never have taken Iwo Jima”(14). Signal officer Howard Conner had six Navajo Code Talkers with him and during the first two days of the battle of Iwo Jima from February 1945 they sent over 800 messages, all without error(14).  One of the final transmissions of World War II were American scientists’ observations of the August 9, 1945 atomic bombing of Nagasaki and it was sent back via the Navajo Code(15).

In retrospect

The Navajo Code had everlasting fame as a military code. This code that was developed for the Marine Corps served with success from 1942 to 1945.  The complex and thoroughly detailed nature of the Navajo Code made it perfect for military use and was different from other Native American codes. Except for a close call, the Code was never broken. The Navajo Code was truly unbreakable!

Now, read Daniel’s article on “Did World War Two Japanese Kamikaze Attacks have more Impact than Nazi V-2 Rockets?” here.

[1] Avila, Judith and Nez, Chester. Foreword by Bingaman, Jeff United States Senator from New Mexico. Code Talker: The first and only memoir by one  of the original Navajo code talkers of WWII.  New York: New York. Dutton Caliber. 2011. 93. 

[2] Avila, Judith and Nez, Chester. Forward by Bingaman, Jeff United States Senator from New Mexico. Code Talker: The first and only memoir by one of the original Navajo code talkers of WWII.  New York: New York. Dutton Caliber. 2011. 90. 

[3] Avila, Judith and Nez, Chester. Forward by Bingaman, Jeff United Sates Senator from New Mexico. Code Talker: The First and only memoir by one of the  original Navajo code talkers of WWII.  New York: New York. Dutton Caliber. 2011. 92. 

[4] Avila, Judith and Nez, Chester. Forward by Bingaman, Jeff United States Senator from New Mexico. Code Talker: The first and only memoir by one of the original Navajo code talkers of WWII. New York: New York. Dutton Caliber. 2011. 101-102. 

[5] Avila, Judith and Nez, Chester. Forward by Bingaman, Jeff United States Senator from New Mexico. Code Talker: The first and only memoir by one of the original Navajo code talkers of WWII.  New York: New York. Dutton Caliber. 2011. 109.

[6] Avila, Judith and Nez, Chester. Forward by Bingaman, Jeff United States Senator from New Mexico. Code Talker: The First and only memoir by one of the original Navajo code talkers of WWII. New York: New York. Dutton Caliber.  2011. 91. 

[7] Avila, Judith  Schiess and Nez, Chester. Forward by Bingaman, Jeff United States Senator from New Mexico. Code Talker: The first and only memoir by one of the original Navajo code talkers of WWII. New York: New York. Dutton Caliber. 2011.  91-92. 

[8] Navajo code talkers of World War II: Journey of Remembrance. Dreamscape-Contemporary Learning Systems. Starbright Media Corporation production. 2018. 

[9] “American Indian  Code Talkers, The National WWII Museum-New Orleans”.  December 12th, 2020. https://www.nationalww2museum.org/war/articles/american-indian-code-talkers . 

[10] Avila, Judith Schiess and Nez, Chester. Forward by Bingaman, Jeff, United States Senator from New Mexico. Code Talker: The first and  only memoir by one of the original Navajo code talkers. New York: New York. Dutton Caliber. 2011. 273-291. 

[11] Greenspan, Jesse. “How Native American Code Talkers Pioneered a  Type of Military Intelligence”. Updated:  November 11th, 2020. History Channel.  Accessed January 1st, 2021. https://www.history/com/news/world-war-is-native-american-code-talkers . 

[12] McIntyre, Cindy. “Comanche language helped win World War II”. Last Modified November 14th, 2017. United States Army. Accessed on January 3rd, 2021. https://www.army.mil/article/178195/comanche_language_helped_win_world_war_ii . 

[13] Avila, Judith Schiess and Nez, Chester.  Forward by Bingaman, Jeff, United States Senator from New Mexico. Code Talker: The first and only memoir by one of the original Navajo code talkers.  New York: New York. Dutton Caliber. 2011. 207-208. 

[14] “Navajo Code Talkers-World War II Fact Sheet, Naval History and Heritage Command”.  December  7th, 2020. https://www.history.navy.mil/research/library/online-reading-room/title-list-alphabetically/n/code-talkers.html . 

[15] Avila, Judith Schiess and Nez, Chester. Foreword by Bingaman, Jeff, United States Senator from New Mexico. Code Talker: The first and only memoir by one of the of the original code talkers. New York: New York. Dutton Caliber. 2011. 215. 

[16] Avila, Judith Schiess, and Nez, Chester. Forward by Bingaman, Jeff, United States Senator from New Mexico. Code Talker: The first and only memoir by one of the original Navajo code talkers. New York: New York. Dutton Caliber. 2011. 133. 

References

“American Indian Code Talkers, The National WWII Museum-New Orleans” December 12th, 2020. https://www.nationalww2museum.org/war/articles/american-indian-code-talkers.

Avila, Judith, and Nez, Chester. Foreword by Bingaman, Jeff, United States Senator from New Mexico. Code Talker: The First and only memoir by one of the original Navajo code talkers of WWII. New York: New York. Dutton Caliber. 2011. 

Greenspan, Jesse. “How Native American Code Talkers Pioneered a New Type of Military Intelligence”. History Channel.  Updated: November 11th, 2020. Accessed on January 1st, 2021. https://www.history/com/news/world-war-is-native-american-code-talkers.

McIntyre, Cindy. “Comanche language helped win World War II”. Last Modified November 14th, 2017. United States Army.Accessed January 3rd, 2021. https://www/army.mil/article/178195/comache_language_helped_win_world_war_ii

Navajo Code talkers of World War II: Journey of Remembrance. Dreamscape-Contemporary Learning Systems. Starbright Media Corporation. 2018.

“Navajo Code Talkers-World War II Fact Sheet, Naval History and Heritage Command”.  December 7th, 2020. https://www.history.navy.mil/research/library/online-reading-room/title-list-alphabetically/n/code-talkers.html