Bulgaria

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US Air Force Thunderbirds F16 jets perform as they arrive in the Air Force base of Graf Ignatievo, Bulgaria, east of the capital Sofia, Friday, June, 29, 2007. The Thunderbirds the world-renowned Air Demonstration Unit of the United States Air Force are coming to Bulgaria as part of the Bulgarian - American Days of the Air Force, commemorating the the 95th anniversary of the Bulgarian Air Force and the 60th anniversary of the U.S. Air Force and will perform an air-show at Graf Ignatievo on July, 1. Graf Ignatievo is one of two airbases which will be used by US Air Forces in Bulgaria.(AP Photo/Petar Petrov)

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Gael Monfils, of France, reacts after a shot against Grigor Dimitrov, of Bulgaria, during the fourth round of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Mike Groll)

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Nedko Georgieb visiting with a group from Bulgaria, right, stops to fill up his water bottles near the Washington Monument on the National Mall as temperatures reach into the mid 90s, Washington, D.C., Tuesday, September 2, 2014. (Andrew Harnik/The Washington Times)

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Nedko Georgieb visiting with a group from Bulgaria, right, runs water over his face near the Washington Monument on the National Mall as temperatures reach into the mid 90s, Washington, D.C., Tuesday, September 2, 2014. (Andrew Harnik/The Washington Times)

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Nedko Georgieb visiting with a group from Bulgaria, right, stops to fill up his water bottles near the Washington Monument on the National Mall as temperatures reach into the mid 90s, Washington, D.C., Tuesday, September 2, 2014. (Andrew Harnik/The Washington Times)