"Comanche soldiers of the 4th Signal Company compiled a vocabulary of 250 code terms using words and phrases in their own language. Using a substitution method similar to that of the Navajo, the code talkers used descriptive words from the Comanche language for things that did not have translations. For example, the Comanche language code term for tank was turtle, bomber was pregnant bird, machine gun was sewing machine, and Adolf Hitler was crazy white man."