Secretary of Defense Jim Mattis is greeted by Mark Sedwill, the national security adviser for the United Kingdom, as he arrives at the London Somalia Conference May 11, 2017, at the Lancaster House in London. (DOD

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Keywords: air, america, archive, armed, army, chaos, defence, defense, force, forces, james, jim, mattis, military, navy, reportage, secdef, secretary, service, serviceman, servicemen, soldier, states, united, usa