Hon. Michael Duffey

Under Secretary for Acquisition and Sustainment

U.S. Department of War (DOW)

The Honorable Michael Duffey was sworn in as the Under Secretary of Defense for Acquisition and Sustainment (USD(A&S)) on June 5, 2025. In this role, he is responsible to the Secretary of Defense for all matters pertaining to acquisition; contract administration; logistics and materiel readiness; installations and environment; operational energy; nuclear deterrence, chemical, and biological defense; the acquisition workforce; and the defense industrial base.

Over the past two decades, Mr. Duffey has served in several senior roles throughout the Department of Defense, including Deputy Chief of Staff to the Secretary of Defense, Chief of Staff to the Under Secretary of Defense for Research and Engineering, as well as multiple positions in in the former Office of the Under Secretary of Defense for Acquisition, Logistics and Technology. Throughout his tenure in the Department, Mr. Duffey has led efforts to improve the application of systems engineering in the Department’s development and procurement of our most complex weapon systems, established a capability to prioritize and protect critical technologies from exfiltration by our adversaries, and led teams developing critical technologies that maintain U.S. technological advantage on the battlefield.

In addition to his leadership at the Department of Defense, Mr. Duffey served as the Program Associate Director for National Security at the Office of Management and Budget (OMB), where he oversaw the entire $1+ trillion national security budget for the United States Government, including the Departments of Defense, State, Veterans Affairs, the Office of the Director of National Intelligence, the Central Intelligence Agency, and several international economic agencies. In his role at OMB, Mr. Duffey worked with Department leadership to publish a robust 30-year shipbuilding strategy prioritizing U.S. maritime superiority, and led efforts to fund nuclear modernization and the standup of the U.S. Space Force.

Under Secretary of Defense for Acquisition and Sustainment Duffey is a graduate of the University of Wisconsin.

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