Describe the process of code talking.

On the first day of training, the recruits are requested to write down the English word for a Navajo word that is spoken by the instructor. Then the recruits are told that they have to learn a code that can't be broken by the enemy using their own language (Navajo). The students were able to begin learning the code, but they were unable to put it in writing..... ANYTHING containing the words written in the classroom was forbidden to be taken out of the classroom. The code itself was created by giving the specific letters of the alphabet a corresponding word in Navajo in the Navajo language. This included multiple Navajo words for letters that were used most frequently.