HAL BRANDS, the Henry A. Kissinger Distinguished Professor of Global Affairs at the Johns Hopkins School of Advanced International Studies and a scholar at the American Enterprise Institute, served as Special Assistant to the Secretary of Defense in 2015-2016. PETER FEAVER, Professor of Political Science and Public Policy at Duke University, served as special adviser for strategic planning and institutional reform at the National Security Council staff in 2005-2007 and as director for defense policy and arms control in 1993-1994.