Defense Secretary Ash Carter, right, discussed national defense issues and the force of the future during a moderated conversation at the John F. Kennedy Jr. Forum at Harvard University’s Institute of Politics in Cambridge, Mass., Dec. 1, 2015. Graham Allison, left, director of the Belfer Center and Douglas Dillon Professor of Government, served as the moderator. DoD photo by U.S. Army Sgt. 1st Class Clydell Kinchen