
President Harry S. Truman signed the National Security Act on September 18, 1947, establishing the U.S. Air Force as a separate branch of the military. This act was part of a larger restructuring of the military and intelligence agencies after World War II. The reorganization created the Department of Defense and consolidated the military branches under a unified command structure.

President Harry S. Truman signed the National Security Act on September 18, 1947, establishing the U.S. Air Force as a separate branch of the military. This act was part of a larger restructuring of the military and intelligence agencies after World War II. The reorganization created the Department of Defense and consolidated the military branches under a unified command structure.
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