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ON THIS DAY September 18, WE CELEBRATE THE U.S. Air Force Birthday! The U.S. Air Force Birthday is celebrated annually on September 18. The date is connected to 1947, when the National Security Act was signed, resulting in the Air Force becoming a separate branch of the military, independent from the U.S. Army. Before that, aviation units existed as part of the Army. Significance of the holiday This day symbolizes recognition of the role of aviation and space technologies in ensuring national security. The U.S. Air Force plays a key role in national defense, intelligence, strategic operations, and space exploration. https://dayspedia.com/us/calendar/holiday/5099/#:~:text=The%20U.S.%20Air%20Force%20Birthday%20is%20celebrated%20annually,aviation%20units%20existed%20as%20part%20of%20the%20Army.