What document provides guidelines on Navy organizational structures and policies?

The correct answer is that the document that provides guidelines on Navy organizational structures and policies is the OPNAVINST (OpNav Instruction). OPNAVINSTs are directives issued by the Chief of Naval Operations and cover a broad range of policy areas, including organizational structure, operational procedures, and administrative guidance. These instructions are essential for understanding how various components of the Navy operate and interact with each other.

NAVREGS, or Navy Regulations, primarily focus on the conduct of personnel within the Navy and establish the rules and standards that govern individual and collective behavior. While they are important, they do not specifically lay out organizational structure guidelines.

SORN refers to a System of Records Notice, which is related to data privacy and records management, not organizational structure.

SECNAV Instructions pertain to directives issued by the Secretary of the Navy and generally cover broader policies than the specific instructions found in OPNAVINSTs. While both are important in the hierarchy of Navy documentation, OPNAVINSTs are the primary source for specific organizational guidelines and policies.