What significant outcome resulted from the National Security Act of 1947?

The significant outcome that resulted from the National Security Act of 1947 is the legitimization of the Joint Chiefs of Staff. This legislation was a pivotal moment in the evolution of U.S. military structure and national security policy. By formally incorporating the Joint Chiefs of Staff into the national defense framework, the Act reinforced their role in advising the President and the Secretary of Defense on military matters, thus enhancing the cohesion and effectiveness of military advice provided at the highest levels of government.

The Joint Chiefs of Staff were positioned as a critical authority in strategic military planning and operations, which was essential during the post-World War II era as the U.S. was reconfiguring its military policies amidst emerging global tensions. This action was crucial in transitioning the U.S. military towards a more integrated and coordinated approach, especially against the backdrop of the Cold War.

Other options, while relevant to the broader context of post-war military organization, do not encapsulate the primary impact of the 1947 Act as directly as the legitimization of the Joint Chiefs of Staff. For example, the creation of intelligence agencies or developmental agencies came later and were influenced by different legislative actions unrelated to this specific act's central purpose of restructuring the military command and national security oversight.