Florida Arrival Defense Secretary Jim Mattis and the senior enlisted advisor to the chairman of the Joint Chiefs of Staff, Army Command Sgt. Maj. John Troxell, arrive at MacDill Air Force Base in Tampa, Fla., Oct. 11, 2017. DoD photo by SHARE IMAGE: Download Image: Full Size (1.17 MB) Tags: Defense Secretary Jim Mattis Photo By: Army Sgt. Amber I. Smith VIRIN: 171011-D-SV709-006.JPG Photo Gallery