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Secretary of Defense James Mattis shakes hands with Pacific Command (USPACOM) commander Adm. Harry Harris as he departs USPACOM headquarters, on the stop of an overseas trip, May 31, 2017. This is the first time Mattis has visited USPACOM headquarters since holding office as Secretary of Defense. During the meeting Mattis also met with USPACOM component commanders where they discussed challenges and opportunities in the Indo-Asia-Pacific region.