JP 3-28, page 28

Chapter I I-6 JP 3-28 nation’s HS efforts. While the Department of Homeland Security (DHS) is the lead federal agency (LFA) for mitigating vulnerabilities, threats, and incidents related to terrorism, its responsibilities also include preparing for, responding to, and recovering from natural disasters; stemming illegal drug flows; thwarting illegal immigration; strengthening border security; promoting the free flow of commerce; conducting critical infrastructure protection (CIP); and safeguarding and securing cyberspace. (3) The President of the United States is uniquely responsible for the safety and security of the nation. The President leads the overall HS policy direction and coordination. United States Government (USG) departments and agencies, in turn, are empowered by law and policy to fulfill various aspects of the HS mission. DHS has the mission to: (a) Prevent terrorism and enhance security, (b) Secure and manage US borders, (c) Enforce and administer immigration laws, (d) Safeguard and secure cyberspace, (e) Ensure resilience to disasters, and (f) Mature and strengthen the HS enterprise. (4) However, as a distributed system, no single entity has the mission to directly manage all aspects of HS. (5) Three key concepts form the foundation for a comprehensive approach to HS: (a) Security: protect the US and its people, vital interests, and way of life; (b) Resilience: foster individual, community, and system robustness, adaptability, and capacity for rapid recovery; and (c) Customs and exchange: expedite and enforce lawful trade, travel, and immigration. b. HD is the protection of US sovereignty, territory, domestic population, and critical infrastructure against external threats and aggression or other threats, as directed by the President. DOD is responsible for HD. For additional information on HD, see JP 3-27, Homeland Defense, and DODD 3160.01, Homeland Defense Activities Conducted by the National Guard. c. DOD plays a vital role in all three missions involving the homeland—HD, HS, and DSCA. The key difference between the three missions is that DOD is responsible for the federal response to HD; DOD is in support of other federal agencies’ HS responsibilities;