Hundreds of Navajos were recruited by the Marine Corps during World War II to create a code based on their native language. Their efforts frustrated the Japanese force and ended up playing a vital role in U.S. victories in the Pacific War.
The program remained secret for decades and in 1982, President Ronald Reagan signed a proclamation designating Aug. 14 as the official day to honor the Navajo Code Talkers and all Native Americans who served in the war.