Yunck was born in Detroit, Michigan, on August 19, 1918. His action was on October 26 – December 10, 1942 in action against enemy Japanese forces in the Solomon Islands area. He was a part of the Battalion, Marine Observation Squadron 251 (VMO-251). He was awarded the Silver Star for his actions in the war. He later served as a helicopter pilot in the Vietnam War, where he was awarded a second Silver Star after his leg had to be amputated. He was also presented with the Distinguished Flying Cross.