Final answer:
The DoD's approach to implementing the NSS includes using diplomacy, economic power, and armed forces, guided by the National Security Act of 1947 and documents like NSC-68.
Step-by-step explanation:
The Department of Defense (DoD) implements the President's National Security Strategy (NSS) by outlining policies and measures that ensure national security. These strategies include using diplomacy to rally allies, marshalling economic power to facilitate cooperation, and maintaining effective armed forces. Additionally, the reorganization under the National Security Act of 1947, and adjustments post-9/11, established key agencies such as the National Security Council (NSC) and the Central Intelligence Agency (CIA). It's also worth noting that, historically, documents like NSC-68 have had a profound influence on guiding U.S. foreign policy practices during the Cold War era.