U.S. Defense Secretary Ash Carter, second from right, and U.S. Marine Corps Gen. Joseph F. Dunford Jr., right, chairman of the Joint Chiefs of Staff, meet with Australian Defense Minister Marise Payne, second from left, and Air Chief Marshal Mark Binskin, chief of Australia's Defense Force, during the 2015 Australia-United States Ministerial Consultations in Boston, Oct. 12, 2015.