Which part of the antiterrorism program aims to protect critical assets, capabilities, as well as infrastructure and personnel?

The focus of a comprehensive antiterrorism program is to protect critical assets, capabilities, infrastructure, and personnel, and the "Defend" component plays a vital role in this effort. This part of the program specifically addresses the active measures taken to safeguard against potential threats.

In essence, "Defend" encompasses strategies and actions that are designed to maintain security and thwart any attacks that may occur. It includes the deployment of personnel, security measures, and protocols that create a robust defense against identified risks. By prioritizing the defense of vital resources, this component ensures that an organization or installation can continue operations and maintain safety, effectively minimizing vulnerabilities in the face of terrorism.

The other components of an antiterrorism program—such as "Prevent," "Detect," and "Respond"—play supportive roles. While they are crucial for overall situational awareness and preparedness, they do not specifically focus on the defense of assets in the same way that "Defend" does.