National Day

Air Force Birthday

Celebrated on 09/18/2026

Quick Fact

The United States Air Force was officially established as a separate military branch on September 18, 1947, with the signing of the National Security Act. Prior to that, it was part of the U.S. Army Air Forces. The Air Force Birthday is celebrated annually on this date, making it the newest of the six U.S. armed services.

Origins and Establishment of Air Force Birthday

The United States Air Force (USAF) was created on September 18, 1947, when the National Security Act of 1947 became law. This act reorganized the U.S. military structure, establishing the Department of the Air Force as a separate entity from the U.S. Army. Prior to this, military aviation was under the U.S. Army Air Forces (USAAF), which had played a critical role in World War II. The need for a dedicated air force was recognized due to the increasing importance of air power in modern warfare, and the new branch was tasked with providing air superiority, global strike, rapid global mobility, intelligence, surveillance, and reconnaissance. The first Secretary of the Air Force was W. Stuart Symington, and the first Chief of Staff was General Carl Spaatz.

Evolution and Modern Commemoration

Since its establishment, the Air Force has evolved significantly, adopting new technologies such as jet aircraft, stealth technology, drones, and space-based systems. The Air Force Birthday is now commemorated with various events, including formal balls, award ceremonies, and open houses at air bases. Units often hold cake-cutting ceremonies, and the day is used to honor the service and sacrifice of airmen. The celebration also highlights the Air Force's core values: Integrity First, Service Before Self, and Excellence in All We Do. In recent years, the Air Force has emphasized its role in space operations, with the creation of the U.S. Space Force in 2019 as a separate branch, though the Air Force continues to support space missions.

Facts & General Observations

  • The U.S. Air Force is the largest and most technologically advanced air force in the world, with over 5,000 aircraft in active service.
  • The Air Force operates a network of bases across the globe, including major installations in the U.S., Europe, Asia, and the Middle East.
  • The Air Force Birthday is not a federal holiday, but it is widely observed within the military community and by aviation enthusiasts.

Explore more celebrations, trivia, and quests on National Day Quest.