homeland security

Homeland security is the term generally used to refer to the broad national effort by all levels of government--federal, state, local and tribal--to protect the territory of the United States from hazards both internal and external, natural and man-made, as well as the Department of Homeland Security itself.
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Noun
1. an independent agency established by and accountable to the President in 2001; develops and implements a national strategy to make the United States safe from terrorist threats or attacks
(synonym) Office of Homeland Security
(hypernym) independent agency