National Security Act Amendments of 1949

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The National Security Act Amendments of 1949 were U.S. legislation that reorganized and strengthened the post–World War II national security structure, notably transforming the National Military Establishment into the Department of Defense and refining the roles of key defense and intelligence agencies.


Statements (46)
Predicate Object
instanceOf United States federal statute
amendment to the National Security Act of 1947
affectedAgency Department of the Air Force
Department of the Army
Department of the Navy
amends National Security Act of 1947
appliesTo United States armed forces
United States intelligence community
clarifiedRoleOf Secretary of Defense
codifiedIn United States Code (Title 10 and related titles)
country United States
created Department of Defense
enhancedAuthorityOf Secretary of Defense
governs relationships among the military departments and the Secretary of Defense
historicalContext post–World War II era
influencedBy emergence of the Cold War
lessons of World War II
jurisdiction United States federal government
language English
legalForm public law
legislativeBody United States Congress
longTermImpact established the modern structure of the U.S. Department of Defense
institutionalized centralized civilian leadership over the military
partOf post–World War II U.S. national security reorganization
placedUnder Department of Defense
policyArea defense organization
intelligence coordination
national security
presidentAtEnactment Harry S. Truman
purpose to consolidate military departments under a single Department of Defense
to improve coordination among defense and intelligence agencies
to reorganize and strengthen the U.S. national security structure
refinedRoleOf Central Intelligence Agency
Joint Chiefs of Staff
National Security Council
relatedTo Cold War military planning
U.S. defense reorganization
reorganized United States military establishment
United States national security structure
resultedIn creation of a unified Department of Defense
greater centralization of defense authority
signedBy Harry S. Truman
strengthened civilian control of the military
successorTo National Military Establishment framework of 1947
transformedFrom National Military Establishment
yearEnacted 1949

Referenced by (3)

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