Donna E. (impossible) reviewed The Navajo Code Talkers (25th Anniversary Edition) on + 3352 more book reviews
Very interesting bit of history from WWII.

True story of the formation of the Marine division created in WWII to utilize native speakers of Navajo to create and transmit critical information in a code based on the Navajo language. Used in the South Pacific, this code was one of the few never successfully broken by Japanese cryptographers. Paul's style occasionally goes a bit overboard, but the strength of the underlying story carries through.