GRAF IGNATIEVO AIR FORCE BASE, Bulgaria - An F-15 Eagle from the 493rd Fighter Squadron at RAF Lakenheath, England, lands at Graf Ignatievo Air Force Base in Plovdiv, Bulgaria, May 13, 2010. Airmen from the 48th Fighter Wing are in Bulgaria taking part in Sentry Gold, an exercise developed to familiarize U.S. pilots with the MiG airframes, build partnerships with the Bulgarian air force and assist them in their continued integration into NATO operations.