U.S. Deputy Secretary of Defense Ashton B. Carter, left, speaks to U.S. Service members upon his arrival at a Turkish army base in Gaziantep, Turkey, Feb. 4, 2013. Carter was visiting the area to view Patriot missile batteries installed with assistance from U.S. troops. U.S. and NATO Patriot missile batteries and personnel deployed to Turkey in support of NATO's commitment to defending Turkey's security during a period of regional instability.