Donald enlisted in the Navy in 1940, and he was commissioned an ensign in 1941 after successfully completing the Navy's "90-day wonder program" on the USS Arkansas (BB-33). He was stationed at Pearl Harbor and was aboard the USS Farragut (DD-348) when Pearl was attacked. He was stationed on the Farragut until 1943 and was then transferred to another destroyer, the USS Halford (DD-480), until the end of the war. During his wartime service, he was awarded 11 battle stars including Guadalcanal, Wake Island, Coral Sea, Marianas Islands Campaign (Navy Commendation Medal) and Leyte Gulf (Bronze Star with Valor). In his quiet and humble manner, he was proud to have served his country at a crucial time in its history and to have been a Pearl Harbor survivor.