Which position does the abbreviation GM correspond to in the naval hierarchy?

The abbreviation GM corresponds to Gunner's Mate in the naval hierarchy. This designation is used in various naval forces, including the U.S. Navy and the U.S. Coast Guard, to refer specifically to personnel who are trained and responsible for handling and maintaining naval ordnance, weapons systems, and the equipment related to them.

Gunner's Mates play a crucial role in ensuring that weapons are functional, safe, and ready for use, making them vital to the ship's operational readiness. Their training includes both technical knowledge and practical skills in ordnance handling, which is essential for effective naval operations.

The other choices do not align with established naval ranks or roles. For instance, while "Gunners and Mechanics" and "General Maintenance" might represent broad job categories, they are not officially recognized ranks within the naval hierarchy. "Ground Mechanics" is similarly not a designation found in naval service. Hence, Gunner's Mate is the only accurate and established term reflecting a specific rank and role in the naval structure.