It’s really quite simple: deterrence of an attack on the United States by a hostile nation rests, ultimately, on the nuclear triad — intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs) and bombers. While each leg of the triad plays a critical role in deterring aggression, there are some circumstances in which the land-based missile force could make the difference between war and peace. For that reason, the United States will need to develop and deploy a new ICBM, now called the Ground-Based Strategic Deterrent (GBSD). I have written about this for National Interest.
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