On February 20, 2018, President Trump issued a memorandum delegating authorities granted under Section 1245 of the National Defense Authorization Act for Fiscal Year 2018. This provision had authorized the President to exercise certain national defense powers, but the memorandum transferred those authorities to designated executive branch officials—primarily within the Department of Defense and State Department—allowing them to act on defense and military matters without requiring presidential sign-off on each individual decision. The delegation streamlined the bureaucratic process by enabling lower-ranking officials to exercise congressionally-granted powers across defense operations and potentially related foreign policy actions.

The immediate effect expanded decision-making power among Pentagon leadership and State Department officials regarding military deployments, arms transfers, and defense-related agreements. Military commanders gained greater autonomy in certain operational contexts, while State Department officials involved in arms sales could move more quickly on transactions. This affected not only the government machinery itself but also international partners and adversaries who suddenly faced a less centralized American decision-making apparatus, potentially altering diplomatic and military dynamics in real time.

This delegation exemplifies a broader pattern visible in subsequent Trump administration actions. The 2026 fast-tracking of $8.6 billion in arms deals to Middle Eastern partners and the deployment of thousands of additional sailors and Marines to enforce a maritime blockade against Iran demonstrate how delegated authorities enabled rapid military and defense actions without presidential deliberation. The withdrawal of 5,000 troops from Germany similarly reflected the administration's ability to move quickly on major strategic decisions. Each action built upon the foundation of decentralized decision-making authority, accelerating the pace and reducing the friction points in executing foreign policy and military strategy.

No significant legal challenges to the February 2018 delegation appear to have emerged, partly because the memorandum operated within congressionally-delegated authority rather than circumventing it. However, the pattern of rapid military deployments and arms sales that followed raises questions about oversight mechanisms and whether the intended congressional review processes remained meaningful as decisions devolved to subordinate officials operating under the broad delegated framework.