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Home DoD

Trump Nominates Mark Ditlevson as Assistant Secretary of Defense for Homeland Defense, Hemispheric Affairs

by Elodie Collins
October 6, 2025
in DoD, Executive Moves, News
Mark Ditlevson, acting ASW-HDHA. Ditlevson was nominated to replace Melissa Griffin Dalton

President Donald Trump has named Mark Ditlevson as his nominee for the role of assistant secretary of defense for homeland defense and hemispheric affairs.

President Donald Trump has nominated Mark Ditlevson as the next assistant secretary of defense for homeland defense and hemispheric affairs. According to Congress records, the nomination was received by the Senate on Oct. 2 and has since been referred to the Committee on Armed Services.

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  • Who Is Mark Ditlevson?

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If confirmed, Ditlevson will succeed Melissa Griffin Dalton, who served in the position under President Joe Biden. 

Trump Nominates Mark Ditlevson as Assistant Secretary of Defense for Homeland Defense, Hemispheric Affairs

Learn more about the global threats the U.S. is currently facing and key developments in homeland security at the Potomac Officers Club’s 2025 Homeland Security Summit on Nov. 12. The in-person event will feature panel discussions between government officials and industry leaders on artificial intelligence and other technologies that may shape the future of homeland security operations. Purchase your tickets today.

Who Is Mark Ditlevson?

Ditlevson currently sits as the acting assistant secretary of defense for homeland defense and hemispheric affairs. In the role, he oversees policy and planning for matters related to homeland defense, including providing defense support for civil authorities, and manages defense relations across the Western Hemisphere. 

On LinkedIn, Ditlevson shared that he served as policy adviser to the Office of the Secretary of Defense and as special assistant to the assistant secretary of defense for special operations and low intensity conflict. He also served as an explosives ordnance disposal officer for the U.S. Navy for over six years. 

The seasoned government leader holds a bachelor’s degree in political science from the U.S. Naval Academy.

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