民間防衛
The new dimensions of nuclear war terrified the world and the American people. The sheer power of nuclear weapons and the perceived likelihood of such an attack on the United States precipitated a greater response than had yet been required of civil defense. Civil defense, something previously considered an important and common-sense step, also became divisive and controversial in the charged atmosphere of the Cold War. In 1950, the National Security Resources Board created a 162-page document outlining a model civil defense structure for the US. Called the "Blue Book" by civil defense professionals in reference to its solid blue cover, it was the template for legislation and organization that occurred over the next 40 years. Despite a general agreement on the importance of civil defense, Congress never came close to meeting the budget requests of federal civil defense agencies. Throughout the Cold War, civil defense was characterized by fits and starts. Indeed, the responsibilities were passed through a myriad of agencies, and specific programs were often boosted and scrapped in a similar manner to US ballistic missile defense (BMD) systems with which it was seen as complementary.