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July 26, 1947: President Truman Signs National Security Act of 1947

President Harry Truman signs the National Security Act of 1947, reorganizing the military and overhauling the government’s foreign policy-making bureaucracy. The act gives birth to three major organizations: the Department of Defense (DOD), the Central Intelligence Agency (CIA) and the National Security Council (NSC). The DOD unifies the three branches of the military—the Army, Navy and Air Force—into a single department overseen by a secretary of defense. The act establishes a separate agency, the CIA, to oversee all overt and covert intelligence operations. The act forms the NSC to directly advise the President on all matters of defense and foreign policy. In addition, the act establishes the National Security Resources Board (NSRB) to advise the President “concerning the coordination of military, industrial, and civilian mobilization” in times of war. Should the nation come under attack, the NSRB will be in charge of allocating essential resources and overseeing “the strategic relocation of industries, services, government, and economic activities, the continuous operation of which is essential to the Nation’s security.” (US Congress. House. Senate. 7/26/1947; Trager 11/1977)


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