Which instruction should be referenced for correspondence preparation standards?

The correct instruction for correspondence preparation standards is SECNAV M-5216.5. This instruction provides detailed guidance on how to format and prepare official correspondence within the Department of the Navy. It includes specifications on style, tone, and formatting that are necessary for maintaining consistency and professionalism in official communication.

By following the standards set forth in SECNAV M-5216.5, personnel ensure that their correspondence adheres to the Navy's requirements, which promotes clarity and effectiveness in communication. This instruction is widely regarded as the authoritative source for matters concerning correspondence, making it essential for individuals dealing with official documentation in a Navy context.

The other choices relate to different topics or address specific aspects of Navy operations or personnel management, but they do not focus directly on correspondence preparation standards. Hence, SECNAV M-5216.5 is the go-to reference for anyone needing guidance on official correspondence preparation.