Photo by: Susan Walsh In this Sept. 21, 2018, photo, Defense Secretary Jim Mattis speaks during the 2018 POW/MIA National Recognition Day Ceremony at the Pentagon in Washington. A U.S. administration official says Mattis will leave his post Jan. 1, 2019, as President Donald Trump is expected to name deputy defense chief Patrick Shanahan as acting secretary. (AP Photo/Susan Walsh) **FILE**
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