What type of manual is OPNAVINST 4790.4 3-M?

The correct answer is that OPNAVINST 4790.4 pertains to maintenance procedures and is classified as a Maintenance Manual. This instruction outlines the procedures for the Maintenance Material Management (3-M) system, which is essential for maintaining naval equipment and ensuring operational readiness. It details the responsibilities, processes, and required documentation for maintenance activities, thus playing a crucial role in the effectiveness of the maintenance program within the Navy.

Understanding the importance of this manual is key for logistics specialists, as it dictates how maintenance is to be conducted and tracked, ensuring that all equipment is kept in optimal working condition. This includes standards for inspections, maintenance cycles, and record-keeping that are vital for operational success.