Two Bulgarian air force Sukhoi Su-25 Frogfoot aircraft take off during Thracian Star at Graf Ignatievo Air Base, Bulgaria, on July 13, 2015. Airmen and F-16s from the 177th Fighter Wing of the New Jersey Air National Guard flew sorties with the Bulgarian air force in the bilateral training exercise, designed to enhance interoperability with the Bulgarian air force. (U.S. Air National Guard photo by Master Sgt. Andrew J. Moseley/Released)