"Bravo," former Secretary of Defense Leon E. Panetta's dog, looks around familiar territory as he and Panetta are welcomed to the Pentagon by Secretary of Defense Ash Carter, April 16, 2015. Panetta, the 23rd secretary of defense who served from July 1, 2011, to Feb. 27, 2013, returned to the Pentagon for his official portrait unveiling ceremony. (DOD Photo by Glenn Fawcett/Released)