Protecting the United States from terrorism is the founding mission of the Department of Homeland Security. While America is stronger and more resilient as a result of a strengthened homeland security enterprise, threats from terrorism persist and continue to evolve. Today's threats do not come from any one individual or group. They may originate in distant lands or local neighborhoods. They may be as simple as a home-made bomb or as sophisticated as a biological threat or coordinated cyber attack. More and more, state, local, and tribal law enforcement officers, as well as citizens, businesses, and communities are on the front lines of detection and prevention. Protecting the nation is a shared responsibility and everyone can contribute by staying informed and aware of the threats the country faces. Homeland security starts with hometown security—and we all have a role to play.