A major reason for the Allied success during World War I was German overconfidence in the Enigma. Because of their overconfidence, they were unaware that the British were deciphering their messages. Although this played a large role, it is not the sole cause for the victory of the Allies. In order to win the war, the Allies also had to have some defenses of their own. One of these defenses came in the form of code. The United States was in need for an impenetrable code so that its communications could be secure. The answer came in the form of the Navajo, a Native American tribe.
The Navajo language is incredibly complex; it is unique and does not stem from any other language. Singh quotes Philip Johnston, the mastermind behind using the Navajo language as code, "the Navajo tribal dialect is completely unintelligible to all other tribes and all other people." The United States government employed 420 Navajo code talkers. With these code talkers, the United States had a secure means of communication, which allowed for them to prevent disasters from happening and anticipate potential threats. After the war, the Japanese even admitted that they had not made a dent in breaking the Navajo code.
Having a secure code is vitally important. This is evidenced by the German failure to keep a secure code. Once the British had broken the Enigma, German communications were readily available to the Allies. This allowed for the Allied forces to gain the upper hand. On the other hand, with the United States having a secure code, the Allies were able to communicate without fear of German or Japanese decipherment. The Germans and Japanese may have been able to intercept the messages, but without knowledge of the Navajo language, decipherment was essentially impossible.