Gen. Abidin Ünal, Turkish Air Force Chief of Staff, waves during takeoff in a UH-1N Iroquois at Joint Base Andrews, Md., April 6, 2016. Ünal flew with the 1st Helicopter Squadron during a U.S. visit to strengthen U.S – Turkey relations. (U.S. Air Force photo by Senior Airman Ryan J. Sonnier/RELEASED)