Airmen with the 423rd Security Forces Squadron stand in formation during a National Day of Service and Remembrance ceremony at RAF Alconbury, England on Sept. 11, 2018. The ceremony was conducted as a tribute to the victims of the terrorist attacks which occurred on Sept. 11, 2001 as well as the survivors and those who rose up in service in response to the attacks. (U.S. Air Force photo by TSgt. Brian Kimball)