Ceremonial Oath Defense Secretary James N. Mattis, left, administers a ceremonial oath of office to Army Secretary Mark T. Esper at the Pentagon’s Hall of Heroes, Jan. 5, 2018. Esper’s wife, Leah, holds the Bible. DoD photo by Jim Garamone SHARE IMAGE: Download Image: Full Size (1.52 MB) Tags: Army, James N. Mattis, SecDef, Pentagon Photo By: Jim Garamone VIRIN: 180105-D-FN314-001.JPG Photo Gallery