Homeland defense
Protection of United States sovereignty, territory, domestic population, and critical defense infrastructure against external threats and aggression or other threats as directed by the President of the United States the Department of Defense is the lead Federal agency for homeland defense, including maritime interception, air patrols over U.S. airspace, land-based defense of critical infrastructure and key assets, and use of military forces to protect from attack when directed by the President or Secretary of DHS
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