In public, over the years, officers and officials have described America’s nuclear policy as second-strike deterrence: if an enemy strikes us with nuclear weapons, we will retaliate in kind; this retaliatory power is what deters the enemy from attacking us. In reality, though, American policy has always been to strike first preemptively, or in response to a conventional invasion of allied territory, or to a biological or large-scale cyber attack: in any case, not just as an answer to a nuclear attack. All of these options envision firing nuclear weapons at military targets for military ends;
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