Homeland security is a topic that has generated a great deal of attention in the past 5 years, on both sides of the Atlantic. With the increased focus on the homeland, or domestic, security of states in the aftermath of the terrorist attacks on New York, Washington, Madrid, and London, as well as the response to disasters such as Hurricane Katrina, senior officials have been challenged to provide adequate levels of domestic security consistent with the resources that advanced Western states have available for these purposes. States have been hard-pressed to develop and equip security forces that will be able to perform the tasks required to maintain a high level of homeland security and support civil authorities in responding to catastrophes. In many instances, leaders have looked to the armed forces to carry out these key missions.