PETERSON AIR FORCE BASE, Colo. - Secretary of Defense James Mattis walks with Gen. Lori Robinson, North American Aerospace Defense Command and Northern Command commander, at Peterson Air Force Base, Colorado May 22, 2018. Mattis is attending the NORAD/USNORTHCOM 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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