WASHINGTON, DC - SEPTEMBER 11: U.S. Defense Secretary Jim Mattis speaks at a ceremony to commemorate the September 11, 2001 terrorist attacks at the Pentagon September 11, 2017 in Washington, D.C. U.S. President Donald Trump was presiding over his first 9/11 commemoration on the 16th anniversary of the terrorist attacks that killed nearly 3,000 people when hijackers flew commercial airplanes into New York's World Trade Center, the Pentagon and a field near Shanksville, Pennsylvania. (Photo by Andrew Harrer-Pool/Getty Images)
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