What principle of the DOD's strategic goal focuses on improving domestic and international partner capabilities for homeland security?

The principle that focuses on improving domestic and international partner capabilities for homeland security is "Lead." This principle emphasizes the Department of Defense's role in taking initiative and providing direction in security-related matters, particularly during emergencies and disasters. By leading, the DOD aims to enhance the capabilities of both domestic organizations, such as local and state agencies, and international partners, ensuring that they can effectively respond to security challenges and threats.

Leading encompasses not just a directive approach, but also the act of fostering relationships, sharing best practices, and developing joint training initiatives that improve overall readiness and resilience. This principle is vital in promoting a coordinated and effective homeland security strategy, as it encourages collaboration and ensures that all partners are equipped with the necessary skills and resources to tackle security issues.

In contrast, the other options, although relevant to different aspects of support and coordination, do not specifically focus on the proactive aspect of leadership in enhancing capabilities.