Stop me if you’ve heard this one before: a Pentagon program is over budget. The Sentinel ICBM program is envisioned as a keystone of the US nuclear triad, but why do we need 400 new missiles? Slate columnist Fred Kaplan and Mackenzie Knight from the Federation of American Scientists join Jon Wolfsthal and Heather Williams to shine a light on the program and why it may, or may not, be necessary.
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