Navajo Code Talkers Marine Corps Cpl. Henry Bake, Jr. and Pfc. George H. Kirk use a portable radio near enemy lines to communicate with fellow Marines in December 1943. The Navajo language proved to be an unbreakable military code that assisted Navy and Marine operations in the Pacific during World War II. The secret of the Navajo Code Talkers and the use of the Navajo language would not be revealed until the late 1960s.