"In this Oct. 30, 2017, file photo, Secretary of Defense Jim Mattis, testifies during a Senate Foreign Relations Committee hearing on ""The Authorizations for the Use of Military Force: Administration Perspective"" on Capitol Hill in Washington. A half century after the Tet Offensive punctured American hopes for victory in Vietnam, Mattis is visiting the former enemy to promote closer ties. Mattis will be in Vietnam just days before the 50th anniversary of the Communist offensive on Jan. 30-31, 1968, in which North Vietnam attacked an array of key objectives in the South, including the city of Hue. (AP Photo/Manuel Balce Ceneta, File)"
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