A detailed sign explaining the Navajo language code the U.S. used during 
WWII.  The full-size image is legible.  The big text provides a good 
overview.  The small text at the bottom shows the dictionary used by the 
Navajo.  While most needed words already existed in Navajo, it's 
interesting that some invented words use the English spelling as 
inspiration.  For instance, the Navajo word they chose to mean "abreast" 
literally translates as "ant breast."  Also, activity become the 
Navajo that means "action ending in Y."  On the other hand, the names of 
organization don't bear a connection to the meaning: division becomes 
salt, regiment becomes edge water, company becomes Mexican, etc.

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Also, I'm amused that Africa is in the list of Names of Countries (and 
its literal translation in Navajo means blackies).