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Capt. Derek Patrick, 37th Airlift Squadron pilot, flies over Plovdiv, Bulgaria during a formation flight during Exercise Thracian Summer 2016 July 17, Plovdiv, Bulgaria. Through Exercise Thracian Summer, the U.S. and Bulgaria will enhance their mutual ability to work together, with other NATO nations, and with key partners on regional security (U.S. Air Force photo/Senior Airman Nicole Keim)