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U.S. Defense Secretary Jim Mattis  inspects a guard of honor during a welcome honor guard ceremony at Defense Ministry in Seoul, South Korea, Saturday, Oct. 28, 2017. (AP Photo/Lee Jin-man)

U.S. Defense Secretary Jim Mattis inspects a guard of honor during a welcome honor guard ceremony at Defense Ministry in Seoul, South Korea, Saturday, Oct. 28, 2017. (AP Photo/Lee Jin-man)