150623-D-DT527-528 TALLINN, Estonia (June 23, 2015) Secretary of Defense Ash Carter talks with U.S. Navy and Marines aboard USS San Antonio (LPD 17). Secretary Carter is traveling in Europe to hold bilateral and multilateral meetings with European defense ministers and to participate in his first NATO ministerial as Secretary of Defense. (DOD Photo by Master Sgt. Adrian Cadiz/Released)