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ARLINGTON, VA - APRIL 11: Defense Secretary James Mattis and General Joseph Votel, commander, US Central Command speak at a press conference at the Pentagon April 11, 2017 in Washington, DC. Mattis discussed the recent airstrikes against Syria. (Photo by Aaron P. Bernstein/Getty Images)

ARLINGTON, VA - APRIL 11: Defense Secretary James Mattis and General Joseph Votel, commander, US Central Command speak at a press conference at the Pentagon April 11, 2017 in Washington, DC. Mattis discussed the recent airstrikes against Syria. (Photo by Aaron P. Bernstein/Getty Images)