Assistant Secretary of Defense for Strategy, Plans, and Capabilities


The assistant secretary of defense for strategy, plans, and capabilities is a position in the United States Department of Defense responsible for the overall supervision of DoD policy for strategy, capabilities, forces and contingency plans necessary to implement the national defense strategy. The officeholder reports to the under secretary of defense for policy.

History

On January 9, 2015 Deputy Secretary of Defense Robert O. Work established the position of Assistant Secretary of Defense in accordance with section 906 of the National Defense Authorization Act for Fiscal Year 2010, as amended, PL 111-84, which eliminated all non-presidentially appointed, Senate-confirmed deputy under secretaries of defense. The assistant secretary of defense replaced and assumed the responsibilities of the deputy under secretary of defense. The assistant secretary of defense gained responsibility for advising the secretary of defense and the under secretary of defense on the development of national security and defense strategy, military planning, budgeting, and various force development, force management, and corporate processes. This position also assumed responsibility for security cooperation, previously managed by the assistant secretary of defense for special operations and low-intesinty conflict.

Structure

The ASD is supported by four deputy assistant secretaries, each with coverage of a different mission area:
  • Force development and emerging capabilities
  • Global partnerships
  • Plans and posture
  • Strategy

Officeholders

The table below includes the holders of this office.
NameTenureSecDef served underPresident served under
Robert ScherJanuary 9, 2015 – January 20, 2017Chuck Hagel
Ash Carter
Barack Obama
Thomas Harvey January 20, 2017 – August 30, 2018Jim MattisDonald Trump
James H. AndersonAugust 30, 2018 – July 20, 2019Jim MattisDonald Trump
Victorino Mercado July 20, 2019 – March 2, 2020Jim Mattis
Mark Esper
Donald Trump
James H. AndersonMarch 2, 2020 – June 8, 2020Mark EsperDonald Trump
Victorino MercadoJune 8, 2020 – January 20, 2021Mark EsperDonald Trump
Melissa Dalton January 20, 2021 – August 23, 2021Lloyd AustinJoe Biden
Mara KarlinAugust 23, 2021 – December 20, 2023Lloyd AustinJoe Biden
Melissa Dalton August 23, 2021 – February 14, 2022Lloyd AustinJoe Biden
Madeline Mortelmans December 20, 2023 – January 20, 2025Lloyd AustinJoe Biden
Austin Dahmer January 22, 2025 – March 17, 2025Pete HegsethDonald Trump
Madeline Mortelmans March 17, 2025 – April 21, 2025Pete HegsethDonald Trump
Rafael Leonardo April 21, 2025 - PresentPete HegsethDonald Trump