Which agency assumes authority over any situation defined as a National Security Incident?

• A. Department of Health and Human Services
• B. Environmental Protection Agency
• C. Department of Education
• D. Department of Homeland Security

Answer: (D)

When a situation is defined as a National Security Incident, there needs to be a single, central lead to coordinate the nationwide response across all levels of government and partners. The Department of Homeland Security is the primary federal lead for these events, established to oversee and unify how the nation protects against and responds to threats to homeland security. DHS brings together components like FEMA, the Coast Guard, CBP, and others, orchestrating a cohesive response plan and ensuring resources are used efficiently. Other agencies—such as public health, environmental, or education departments—play important support roles relevant to their areas (for example, public health in a biothreat or disease outbreak, or environmental cleanup in a chemical incident), but they do not take overall leadership for the national security incident itself. In practice, DHS coordinates with these agencies and with investigative bodies (like the FBI) as needed, to manage the incident from a unified direction.