Airmen and family members from the 501st Combat Support Wing stand at attention during a playing of the national anthem at RAF Alconbury, England, Dec. 18, 2020. It was a historic day for the 501st CSW as Senior Master Sgt. Kyle Mullen, right, 423rd Communications Squadron superintendent, became the first Airman from the 501st CSW to transition into the USSF. (U.S. Air Force photo by Senior Airman Eugene Oliver)