170907-D-SV709-0174 WASHINGTON (Sept. 7, 2017) Secretary of Defense Jim Mattis delivers remarks during a formal swearing in ceremony Sept. 7, 2017 for Secretary of the Navy Richard V. Spencer at the Pentagon in Washington, D.C. Spencer was confirmed as the 76th Secretary of the Navy by the U.S. Senate on Aug. 1, 2017. (U.S. Navy photo by Sgt. Amber I. Smith/Released)