ARLINGTON, VA - JANUARY 21: U.S. Secretary of Defense James Mattis (L) is greeted and escorted by Chairman of the Joint Chiefs of Staff General Joseph Dunford (R) as he arrives for the first day January 21, 2017 at the Pentagon in Arlington, Virginia. Retired General Mattis was confirmed as President Donald Trump's defense secretary by the Senate and sworn in by Vice President Mike Pence yesterday. (Photo by Alex Wong/Getty Images)
Getty Images

Getty Images News Alex Wong