Birthday Performance Members of the U.S. Air Force Honor Guard commemorate the Air Force’s 74th birthday at the Intrepid Sea, Air and Space Museum in New York City, Sept. 18, 2021. SHARE: Download: Full Size (0.61 MB) Tags: Air Force Credit: Air Force Senior Airman Kevin Tanenbaum VIRIN: 210918-F-YM181-0068C.JPG Photo Gallery