Department of Defense Reorganization Act 1958

The Department of Defense Reorganization Act 1958 (Pub. L. 85-599) was signed into law by President Dwight D. Eisenhower on 6 August 1958. It consolidated the existing National Military Establishment, created by the National Security Act of 1947, into a unified Department of Defense with strengthened joint military authority under the Joint Chiefs of Staff and clearer civilian control by the Secretary of Defense. The act remains the foundational statute giving the Department of Defense its name and legal identity.

The legislation became directly relevant to the 2026 Iran conflict debate when CENTCOM press releases began resolving under the war.gov domain by 1 May 2026, extending Pentagon Secretary Pete Hegseth's FY27 posture branding of a 'Department of War' to live DNS infrastructure. Legal analysts immediately noted that renaming the Department of Defense requires an Act of Congress to amend the 1958 act; no executive order or presidential memo can accomplish a statutory name change unilaterally.

The episode illustrates the limits of executive branch rebranding authority: while Hegseth can direct communications style and branding within his department, altering the statutory name of the Department of Defense would require Congress to pass and the President to sign a new law. Critics argued the war.gov DNS move is at minimum misleading and, if pursued formally, would require congressional legislation not currently before either chamber.