Mark Ditlevson Nominated as Assistant Secretary for Homeland Defense

President Donald Trump has nominated Mark Roosevelt Ditlevson to serve as Assistant Secretary of Defense for Homeland Defense and Hemispheric Affairs, a key leadership role within the U.S. Department of Defense. Ditlevson, who has been serving in an acting capacity, is expected to oversee policy development and strategic planning for homeland defense, mission assurance, and security engagement across the Western Hemisphere.

As Assistant Secretary, Ditlevson would be responsible for shaping defense policies that strengthen the nation’s preparedness and resilience against a broad range of threats, including natural disasters, cyberattacks, and potential military incursions. His portfolio would also include coordination between the Department of Defense, the Department of Homeland Security, and allied defense organizations in the Americas to ensure cohesive responses to emerging security challenges.

Ditlevson brings extensive experience in defense policy, strategic planning, and interagency coordination. Before assuming his current acting role, he served in several senior policy positions within the Department of Defense, where he focused on homeland security integration, continuity of operations, and defense support for civil authorities. His work has been instrumental in advancing the Pentagon’s initiatives to modernize defense infrastructure and enhance national resilience.

If confirmed by the Senate, Ditlevson will succeed a series of interim leaders who have managed the office since early 2024. His nomination reflects the administration’s intent to reinforce homeland defense capabilities amid evolving global security dynamics and heightened geopolitical tensions in the Western Hemisphere.

The Office of the Assistant Secretary for Homeland Defense and Hemispheric Affairs plays a vital role in ensuring that U.S. defense strategy remains aligned with national security priorities. The position also manages defense relationships with Canada, Mexico, and key partners in Latin America and the Caribbean, promoting regional stability and cooperation.

In recent years, the office has prioritized improving defense coordination in response to natural disasters, countering transnational criminal networks, and addressing cyber vulnerabilities affecting critical infrastructure. Ditlevson’s leadership is expected to continue this focus while advancing strategic deterrence and strengthening partnerships across the hemisphere.

With his nomination, the Trump administration underscores its commitment to bolstering homeland defense readiness and maintaining a strong, coordinated defense posture throughout the Americas.

Sources: AirGuide Business airguide.info, bing.com