KABUL, AFGHANISTAN - APRIL 24: U.S. Defense Secretary James Mattis (R) chats with U.S. Army General John Nicholson (L), commander of U.S. Forces Afghanistan, after a news conference at Resolute Support headquarters April 24, 2017 in in Kabul, Afghanistan. Mattis is on a regional tour of the Middle East.  (Photo by Jonathan Ernst - Pool/Getty Images)