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In 1942 more than 400 Navajo were recruited for a special code unit “Navajo code-talkers”. They developed a code in the Pacific which the Japanese could not break.
The code used Navajo words for military references. For example “chicken hawk” meant a “dive bomber” which was “gini” in Navajo.
A naval “destroyer” was a “shark” and the Navajo word for that was “ca-lo”.
The Japanese could never break the code because the Navajo language at that time was not written anywhere, it was just spoken.
The Navajo code was the only Allied code that was never broken during the course of the war.
To learn more about the Navajo Code Talkers, here are some very interesting links