To secure America’s homeland, the Bush Administration has instituted the “defense-in-depth” model; a notion that creates redundancies, considers contingencies, and prepares for the extremes. The model includes three interdependent spheres, physical security, civilian security, and information technology that work in concert with each other. The physical protection of the United States includes its critical infrastructures, from airports to water reservoirs. The goal of civilian security is the defense of millions against and preparation for bioterrorism. With the potential threat for cyber-terrorism intensifying, “defense-in-depth” must consider plans to augment the Nation’s cyber defenses composing a significant component of homeland security efforts.