what year was the u.s. air force established
Rating Newest Oldest. Best Answer: The U.S. Air Force was established a separate branch of the U.S. military on September 18, 1947. Before that it was part of the Army, i.e. the Army Air Force, established July 2, 1926 which replaced the Army Air Service which was founded May 24, 1918. For more information on Air Force history see its web page: