The principal regulatory document of the Department of the Navy is what reference?

The principal regulatory document of the Department of the Navy is the United States Navy Regulations. This document serves as the cornerstone for the governance and conduct of Navy personnel, outlining the expectations, standards, and rules that guide both individual behavior and the collective functioning of the Navy. It is crucial as it establishes uniformity in operations and discipline, ensuring that all sailors understand their duties and responsibilities.

This foundational reference encompasses a wide range of topics including organizational structure, administrative procedures, and ethical conduct, thereby promoting professionalism and accountability within the Navy. By adhering to these regulations, personnel are equipped to maintain order and integrity, which are essential elements of military effectiveness.

In contrast to the other choices, Navy Operational Guidelines, Department of Defense Directives, and Navy Instructions serve specific purposes and provide supplemental guidance within the broader regulatory framework, but none have the authoritative weight or comprehensive nature of the United States Navy Regulations.