Codetalkers

Image taken from wildnesswithin.com
During the Second World War, the Japanese busted almost every code-language the Americans threw at them. The Allies had to come up with a code-language that the Japanese could not decipher. Before this, the Japanese could understand every word the Americans said and this became a tactical problem for the Americans. The Native-American tribe known as the Navajo sent many of its young men to become “code-talkers.” Navajo men were trained as United States Marines and learned to use their language to send coordinates and troop movements over the radio.
Throughout the rest of the Pacific War, the Navajo language proved to be very successful for the Americans. The Japanese could not understand the language and it took hours to decipher it. By the time the Japanese figured out what was being said, American forces would have overrun their positions. The code was never broken. In 2001, a film was made based on the story starring Nicholas Cage named Windtalkers. Throughout the war, while using the Navajo language, hundreds maybe even thousands of lives.