Roy Hawthorne, USMC. Former Navajo code talker. Roy walked the 2 mile parade route. With 1/2 mile left, he got tired and was assisted by two current Navajo marines

"Germany and Japan sent students to the United States after World War I to study Native American languages and cultures, such as Cherokee, Choctaw, and Comanche.
Because of this, many members of the U.S. military services were uneasy about continuing to use Code Talkers during World War II. They were afraid the code would be easily cracked, but that was before they learned about the complexity of Navajo.
The Navajo language seemed to be the perfect option as a code because it is not written and very few people who aren’t of Navajo origin can speak it.
However, the Marine Corps took the code to the next level and made it virtually unbreakable by further encoding the language with word substitution.
During the course of the war, about 400 Navajos participated in the code talker program."