German Federal Minister of Defense Ursula von der Leyen is greeted by the Turkish Minister of National Defense Ismet Yilmaz Jan. 21, 2015 during her visit to Incirlik Air Base, Turkey. Von der Leyen came to Incirlik AB to visit with German forces deployed here. (U.S. Air Force photo by Staff Sgt. Jack Sanders/Released)

Turkish Minister of National Defense Ismet Yilmaz, left, and the German Federal Minister of Defense Ursula von der Leyen sit at the head of a table during a briefing on the future objectives of coalition forces deployed to Incirlik Air Base, Turkey, during the German minister’s visit Jan. 21, 2015. Von der Leyen came to Incirlik AB to visit with German forces deployed here and spoke on the importance of coalition partnership. (U.S. Air Force photo by Staff Sgt. Jack Sanders/Released)

German Federal Minister of Defense Ursula von der Leyen, left, and Turkish Minister of National Defense Ismet Yilmaz speak to media and deployed forces Jan. 21, 2016, on Incirlik Air Base, Turkey. Von der Leyen thanked Turkey for their hospitality and for welcoming German troops to Incirlik AB as part of the coalition forces fighting against the Islamic State of Iraq and the Levant. (U.S. Air Force photo by Airman 1st Class Daniel Lile/Released)

German Federal Minister of Defense Ursula von der Leyen, left, and Turkish Minister of National Defense Ismet Yilmaz speak to media and deployed forces about the positive relationship between Germany and Turkey, as well as ongoing coalition forces operations against the Islamic State of Iraq and the Levant, Jan. 21, 2016, on Incirlik Air Base, Turkey. German Federal Minister of Defense Ursula von der Leyen, left, and Turkish Minister of National Defense Ismet Yilmaz speak to media and deployed forces Jan. 21, 2016, on Incirlik Air Base, Turkey. Von der Leyen came to Incirlik AB to visit with German forces deployed here. (U.S. Air Force photo by Airman 1st Class Daniel Lile/Released)