Which document outlines the roles and responsibilities of the Department of Defense?

The National Security Strategy is the correct answer because it is a comprehensive document that outlines the overarching goals, interests, and priorities of the United States security policy, including the roles and responsibilities of the Department of Defense. It provides guidance on how military resources and capabilities will be used to address national security challenges, thus clarifying how the Department of Defense fits into the broader framework of national security.

This document serves as a foundational piece that directs the strategic planning and operational missions of the armed forces, ensuring alignment with policy objectives set forth by the executive branch. It illustrates how the Department of Defense collaborates with other government entities and international partners to achieve national security goals.

Other options do play significant roles in the context of U.S. defense and military policy. The National Defense Authorization Act establishes budgetary provisions and legislative requirements for the military, while the Joint Strategic Planning System is involved in the strategic planning process of the military. The War Powers Resolution of 1973 limits the president's ability to deploy troops without congressional approval, focusing more on the legislative aspect of military engagement rather than outlining defense roles and responsibilities.