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