613X Engineering/Repair (Surface) LDO

613X is a Limited Duty Officer (LDO) in the United States Navy. LDOs are officers of the line or staff in the Regular Navy and Navy Reserve. They are appointed to perform duties in broad occupational fields indicated by their former warrant designators or enlisted rating groups.

613X is an LDO in the field of surface ship marine engineering.

They serve as technical managers and are responsible for: Maintenance and repair of main propulsion Electrical and auxiliary machinery and systems Ship’s hull

613X LDOs maintain and repair: Gas turbine Diesel Steam Combined diesel-gas turbine