In this Dec. 1, 2015, file photo, then-Defense Secretary Ash Carter responds to a question during a forum at the John F. Kennedy School of Government at Harvard University in Cambridge, Mass. (AP Photo/Steven Senne, File)
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In this Dec. 1, 2015, file photo, then-Defense Secretary Ash Carter responds to a question during a forum at the John F. Kennedy School of Government at Harvard University in Cambridge, Mass. (AP Photo/Steven Senne, File)
