Defense Secretary Ash Carter shakes hands with Barbara Leaf, U.S. ambassador to the United Arab Emirates, at Al-Dhafra Air Base in the UAE, April 16, 2016. On his trip, Carter will visit the UAE and Saudi Arabia to assist the lasting defeat of the Islamic State of Iraq and the Levant, and participate in the U.S. Gulf Cooperation Council defense meeting. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz