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Deputy Defense Secretary Bob Work, second from right on stage, and other defense leaders participate in a panel discussion at the Reagan National Defense Forum in Simi Valley, Calif., Dec. 3, 2016. Joining Work on the panel, among others, were U.S. Pacific Command Commander Navy Adm. Harry B. Harris Jr., and Army Chief of Staff Gen. Mark A. Milley. David Feith of the Wall Street Journal moderated the panel.