How long was Eddie Rickenbacker in the military?

Eddie Rickenbacker served in the military during World War I, enlisting in the U.S. Army Air Service in 1917. He became one of the most famous American fighter pilots of the war, flying combat missions until the end of the conflict in 1918. His military service lasted approximately a year, from his enlistment until the war's conclusion. After the war, he continued to serve in various capacities related to aviation and military affairs.