Official Swearing-In Defense Secretary Jim Mattis swears in Richard V. Spencer as secretary of the Navy during a ceremony at the Pentagon, Sept. 7, 2017. DoD photo by Army Sgt. Amber I. Smith SHARE IMAGE: Download Image: Full Size (0.73 MB) Photo By: Amber I. Smith VIRIN: 170907-D-SV709-0223.JPG Photo Gallery