Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, is interviewed by BBC World News correspondent Yalda Hakim in Canada during the Halifax International Security Forum in Canada, Nov. 17, 2018. Dunford provided insights on the shift towards great power competition in the most recent U.S. National Defense Strategy and the steps the US military is taking to maintain its technological competitive advantage. DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro