FILE - In this Dec. 1, 2015 file photo, 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. Harvard said Tuesday, March 28, 2017, that Carter is returning as a professor of technology and global affairs, and as director of Harvard's Belfer Center think tank. He previously taught at the Ivy League School from 1996 to 2009. (AP Photo/Steven Senne, File)
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