Homeland Security is about a collaborative national effort to secure the homeland from all-threats and all-hazards.
National is used here in the sense of all levels of government: federal, state, local, tribal, and territorial; the public and private sectors; and the American people.
All-threats and all-hazards is used in the sense of all intentional threats (crime, terrorism, war), natural (huricanes, earthquakes and the like), and accidental threats and particularly large scale (e.g. Deepwater Horizon). Homeland security is best served and accomplished through collaborative efforts that transcend governmental, geographical, organizational, and cultural boundaries. DHS and FEMA should promote and support education programs that facilitate the collaboration imperative.