U.S. Secretary of Defense James N. Mattis (left), U.S. Air Force Gen. Darren W. McDew (center) and U.S. Army Gen. Stephen R. Lyons (right) pay respect to the colors during a U.S. Transportation Command change of command ceremony at Scott Air Force Base, Illinois, Aug. 24, 2018. Lyons is the first U.S. Army officer to lead the command since it was established 31 years ago.