ARLINGTON, VA - JANUARY 27: U.S. Defense Secretary Gen. James Mattis greets President Donald Trump at the Pentagon on January 27, 2017 in Arlington, Virginia. (Photo by Olivier Douliery-Pool/Getty Images)
ARLINGTON, VA - JANUARY 27: U.S. Defense Secretary Gen. James Mattis greets President Donald Trump at the Pentagon on January 27, 2017 in Arlington, Virginia. (Photo by Olivier Douliery-Pool/Getty Images)