United States Secretary of Defense

United States Secretary of Defense
Post	United States Secretary of Defense
Style	Mr. Secretary
Department	Department of Defense
Reports to	President of the United States
Seat	The Pentagon
Appointer	President of the United States
Appointer qualified	with Senate advice and consent
Formation	National Security Act of 1947
First	James V. Forrestal

United States Secretary of Defense is the head of the Department of Defense and the principal defense policy advisor to the President. The position directs the formulation of national defense strategy, oversees the armed services, and executes defense budgets and programs authorized by the Congress. As a Cabinet-level official, the Secretary interfaces with Executive Branch agencies, international allies, and intergovernmental organizations during crises and peacetime operations.

Role and Responsibilities

The Secretary is charged by the National Security Act of 1947 and subsequent legislation to exercise authority, direction, and control over the Army, Navy, Marine Corps, and Air Force (and since 2001, the Space Force as organized under the Department of the Air Force), coordinating with combatant commands such as CENTCOM, EUCOM, and INDOPACOM. The Secretary develops force posture, capability development, acquisition programs, and personnel policies, interacting with Defense Acquisition Board processes and the GAO on oversight. The role requires engagement with the Joint Chiefs, including the Chairman, and with civilian agencies like the Department of State and the Department of Homeland Security.

History and Evolution

Created by the National Security Act of 1947 to consolidate functions formerly vested in the Department of War and the Department of the Navy, the office succeeded earlier posts such as the Secretary of War and the Secretary of the Navy. Early Secretaries such as James V. Forrestal and George C. Marshall shaped post‑World War II demobilization and Cold War rearmament. During the Korean War and Vietnam War, Secretaries engaged with Congress on mobilization and with NATO allies like United Kingdom and France on collective defense. The role expanded through reforms after events such as the Iran hostage crisis and the September 11 attacks, influencing counterterrorism coordination with agencies including the CIA and the FBI.

Appointment and Succession

The Secretary is nominated by the President and confirmed by the Senate under the Appointments Clause of the Constitution. Statutory requirements limit appointment of recent military officers; the National Security Act of 1947 and subsequent statutes prescribe a seven‑year separation from active duty for former uniformed officers unless waived by Congress, a provision relevant to nominees like James Mattis and waivers granted by the Senate Armed Services Committee. Succession in the event of vacancy follows statutory order codified within the department and presidential succession guidance, coordinated with the White House and the OMB during transitions.

Organizational Relationships and Authority

The Secretary operates within the Executive Office, but statutory civilian control places the Secretary above military leadership in the chain of command for administrative matters, while the President retains ultimate command authority. The Secretary works closely with the Chairman, the Under Secretary for Policy, the Under Secretary for Acquisition, and the Secretary of the Army, Secretary of the Navy, and Secretary of the Air Force. Internationally, the Secretary engages with defense ministers such as the UK Defence Secretary and organizations like the NATO and the UN on coalition operations and defense cooperation.

Officeholders and Notable Secretaries

Since its creation, notable holders include James V. Forrestal, the first Secretary; George C. Marshall, a statesman linked to the Marshall Plan; Robert McNamara, who oversaw systems analysis in the Vietnam War era; Caspar Weinberger, linked to Reagan administration defense buildup; William Perry, who managed post‑Cold War force adjustments; Donald Rumsfeld, architect of transformation during the Iraq War; and Robert Gates, who served across administrations and emphasized counterinsurgency and interagency reform after September 11 attacks. More recent Secretaries such as Leon Panetta, Chuck Hagel, Ashton Carter, and Lloyd Austin have confronted challenges including operations in Afghanistan, Iraq, great‑power competition with People's Republic of China and Russian Federation, and acquisition reform.

Office of the Secretary and Structure

The Office of the Secretary of Defense (OSD) comprises principal civilian staff offices including the Under Secretary of Defense for Policy, Under Secretary of Defense for Research and Engineering, Under Secretary (Comptroller), and the Assistant Secretary of Defense for International Security Affairs. Support organizations include the DIA, NSA interfaces, and the DLA for sustainment. The OSD establishes policies implemented by the military departments and coordinates with the DARPA for technology initiatives and the DCMA for procurement oversight.

Policy Influence and Major Actions

Secretaries have directed major policy initiatives such as nuclear posture reviews involving the DOE and START negotiations, base realignment and closure processes affecting communities and allies, and defense acquisition reforms interacting with industry partners like Lockheed Martin, Boeing, and Raytheon Technologies. In crisis, Secretaries have overseen operations from Operation Desert Storm to Operation Enduring Freedom and Operation Iraqi Freedom, coordinating with combatant commanders and multinational coalitions including NATO and partner nations. Their influence extends to shaping doctrine, force structure, and interoperability with allies such as Japan and South Korea, and responses to emerging domains like space and cyber in coordination with agencies like the Department of Commerce and NASA.

Category:United States Department of Defense