Chairman of the Joint Chiefs of Staff U.S. Army Gen. Martin E. Dempsey, right, talks with U.K. Chief of General Staff Army Gen. Sir Peter Wall before a meeting with U.K. Prime Minister David Cameron as a part of 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)