Jim Walsh - Research Associate in the Security Studies Program at MIT | Andrew Weber - Former Assistant Secretary of Defense & former Director of the Nuclear Weapons Council | Christine Parthemore - International Affairs Fellow-Japan at the Council on Foreign Relations | Erica Fein - Nuclear Weapons Policy Director at WAND Education Fund | Greg Terryn - Policy Analyst at The Center for Arms Control & Non-Proliferation. What are the arguments for, and especially against, reinvesting in the next generation of nuclear weapons?