U.S. Air Force Day is observed annually on 18th September , marking the founding of the United States Air Force (USAF). It commemorates the establishment of the Air Force as a separate and independent branch of the U.S. military, which occurred on 18 September 1947, following the passage of the National Security Act of 1947. Prior to that, the Air Force was part of the U.S. Army, known as the Army Air Forces (AAF).
This day highlights the contributions and achievements of the men and women who serve in the Air Force, honoring its role in national defense and air superiority. Various events, including ceremonies, air shows, and community outreach programs, are often held to recognize the importance of the Air Force's mission in protecting the United States.
It should not be confused with Armed Forces Day, which celebrates all branches of the U.S. military. U.S. Air Force Day focuses specifically on the history, innovation, and service of the Air Force.