Chairman of the Joint Chiefs of Staff U.S. Army Gen. Martin E. Dempsey, center, listens as U.K. Secretary of State for Defense Philip Hammond talks during a Defense Chiefs Strategic Dialog with the U.S. Joint Chiefs of Staff and their U.K. counterparts in London June 10, 2014. (DOD photo by Mass Communication Specialist 1st Class Daniel Hinton, U.S. Navy/Released)