Secretary Visit Defense Secretary Jim Mattis speaks with Air Force Gen. Lori Robinson, left, commander of U.S. Northern Command, and other defense leaders at Peterson Air Force Base, Colo., Nov. 16, 2017. DoD photo by Army Sgt. Amber I. Smith SHARE IMAGE: Download Image: Full Size (1.51 MB) Tags: Travels , JIm Mattis, Sailors, SecDef, Navy , AIR FORCE, Airmen Photo By: Sgt. Amber I. Smith VIRIN: 171116-D-SV709-0078.JPG Photo Gallery