On what date is the birthday of the U.S. Air Force celebrated?

The birthday of the U.S. Air Force is celebrated on September 18, 1947. This is the date when the National Security Act of 1947 officially established the Air Force as a separate branch of the United States Armed Forces. Prior to this, the Air Force was part of the Army and was known as the Army Air Forces during World War II. The establishment of the Air Force marked a significant moment in military history, reflecting the growing importance of air power in modern warfare. The Air Force has since evolved into a critical component of U.S. defense strategy, and September 18 is commemorated annually to honor its origins, mission, and contributions to the nation.