On July 26, 1947, President Truman signed the National Security Act of 1947, a central document in U.S. Cold War policy. The Act, which took more than a year to craft, directed a major reorganization of the foreign policy and military establishments of the U.S. Government. The Act established the National Security Council (NSC), merged the War and Navy departments into the Department of Defense headed by the secretary of defense, and recognized the Air Force as independent from the Army. The Act also established the role of the CIA by assigning the responsibility of foreign intelligence to the CIA.
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