General Salvador Cienfuegos Zepeda, Mexican Secretary of Defense, arrives and is greeted by Air Force Col. Todd Moore, 21st Space Wing commander, at Peterson Air Force Base, Colorado, May 23, 2018. Secretary Zepeda is attending the North American Aerospace Defense Command and Northern Command change of command ceremony where Air Force Gen. Terrence J. O'Shaughnessy will accept command from Air Force Gen. Lori J. Robinson.

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Keywords: air, america, archive, armed, army, defence, force, forces, military, navy, norad, northcom, reportage, service, serviceman, servicemen, soldier, states, united, usa