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The concept at the core of homeland security is indeed the defense of the homeland. This encompasses a broad spectrum of activities and strategies aimed at protecting the nation's territory, citizens, and critical infrastructure from a variety of threats, including terrorism, natural disasters, and other attacks. The focus on defending the homeland involves coordinating resources and efforts across various government entities, private sector partners, and local communities to ensure that the nation remains safe and secure.

In addition to this foundational concept, other aspects like global cooperation, intelligence sharing, and counter-terrorism strategies play integral roles in enhancing homeland security. However, these elements serve as methods or means to achieve the goal of defending the homeland, rather than being the central concept themselves. By establishing a robust defensive posture, homeland security aims to create a resilient framework that can respond effectively to any threats that arise.