Portrait Unveiling Former Defense Secretary Chuck Hagel speaks during the unveiling ceremony for his official portrait hosted by Defense Secretary Jim Mattis at the Pentagon, May 19, 2017. Hagel served as the 24th Secretary of Defense from 2013 to 2015. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (1.07 MB) Credit: Brigitte N. Brantley VIRIN: 170519-D-GO396-0578.JPG Photo Gallery