170907-D-SV709-0213 WASHINGTON (Sept. 7, 2017) Secretary of Defense Jim Mattis formally swears in Secretary of the Navy Richard V. Spencer during a ceremony Sept. 7, 2017 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)