RAF ALCONBURY, United Kingdom – Tech. Sgt. Mathew Butler, 423rd Security Forces Squadron, receives his certificate for promotion to master sergeant from Col. Steve Sweeney, 423rd Air Base Group commander, and Chief Master Sgt. Michael Ogden, 423rd ABG superintendent, during a promotion ceremony at RAF Alconbury Oct. 31. (U.S. Air Force photo by Staff Sgt. Brian Stives)