Code Talker, by Joseph Bruchac

This book is set in World War Two, and it is about a Navajo boy named Ned Begay, who joins the marines. The Navajo squads had done better in training than any other squads. In the marines, he discovers that the Navajo marines learn a secret code based off of their language. He learns that code and travels through Japan with the other marines, taking the islands one square inch at a time. This is a great book and is based off of real events (not people) from World War Two.