U.S. Defense Secretary Jim Mattis and Marine Corps Gen. Joseph Dunford, the chairman of the Joint Chiefs of Staff, take reporters' questions Aug. 28 at the Pentagon. Credit: DoD photo by Lisa Ferdinando
Defense Secretary Jim Mattis at U.S. Northern Command headquarters in Colorado Springs, Colorado. Credit: DoD
Defense Secretary Jim Mattis announces the 2018 National Defense Strategy. Credit: DoD
U.S. Air Force Gen. Jay Raymond (right), commander of Air Force Space Command, welcomes Deputy Secretary of Defense Patrick Shanahan (left) to Peterson Air Force Base, Colorado, Feb. 5, 2018. Credit: USAF