Homeland Security Exercise and Evaluation Program (HSEEP), Volume I: Overview and Doctrine [Revised May 2004] [open pdf - 807KB]
"The National Strategy for Homeland Security and the Homeland Security Act of 2002 identify the 'prevention of terrorist attacks within the United States' and 'the reduction of vulnerability of the United States to terrorism' as national priorities, and call on first responders to 'minimize the damage and assist in the recovery from terrorist attacks that do occur within the United States.' The Homeland Security Act also transferred the Office for Domestic Preparedness (ODP) from the U.S. Department of Justice (DOJ) to the U.S. Department of Homeland Security (DHS), and assigned ODP 'the primary responsibility within the executive branch of government to build and sustain the preparedness of the United States to reduce vulnerabilities, prevent, respond to, and recover from acts of terrorism.' Although effective approaches to planning, training, and exercises have been developed to mitigate the effects of natural and manmade disasters, homeland security professionals at all levels of government and in all types of communities must prepare to prevent and respond to new threats to public safety from terrorism involving the use of chemical, biological, radiological, nuclear, or explosive (CBRNE) weapons or cyber or agricultural hostility."
Office of Domestic Preparedness: http://www.ojp.usdoj.gov/odp