What technical instruction ensures maintenance procedures are followed?

The correct answer is JFMM, which stands for Joint Fleet Maintenance Manual. This technical instruction serves as a comprehensive guide that provides detailed procedures and standards for the maintenance of Navy ships and aircraft. It ensures that all maintenance activities are carried out in a consistent and effective manner, following established protocols. By adhering to the guidelines set forth in the JFMM, personnel are trained to perform maintenance tasks reliably, ensuring the safety and operational readiness of naval assets.

Other choices, while related to military operations and maintenance, do not specifically focus on maintenance procedures in the same way. OPNAV, which refers to the Office of the Chief of Naval Operations, provides overall naval policy but is broader in scope. COMNAV refers to various commands within the Navy and is more administrative, while MIL-STDs are military standards that define various practices but do not directly address the procedure and methodology for maintenance as the JFMM does. Thus, the JFMM is uniquely positioned to provide the necessary framework for maintaining military equipment in accordance with set procedures.