ARLINGTON, VA - AUGUST 08:  U.S. Secretary of Defense Jim Mattis (L) participates in an enhanced honor cordon to welcome Vietnamese Minister of National defense General Ngo Xuan Lich (2nd L) at the Pentagon August 8, 2017 in Arlington, Virginia. General Ngo Xuan Lich is on a visit in Washington, DC.  (Photo by Alex Wong/Getty Images)