 In 1966, Garrison participated in his third war, as vice commander of the 8th Tactical Fighter Wing, and flew a full tour of bombing and fighter missions over North Vietnam.During all three of his combat tours, Garrison was consistently older than his peers, becoming an ace in World War II at the age of 28, in Korea at the age of 37, and flying Rolling Thunder missions at the age of 51.For this and his renown as a gunnery expert, Garrison was known in the service as "The Gray Eagle".