Damage Controlman DC’s do the work necessary for damage control, ship stability, firefighting, fire prevention, and chemical, biological and radiological (CBR) warfare defense. They also instruct personnel in the methods of damage control and CBR defense, and repair damage control equipment and systems.

Electrician's Mates are responsible for the operation and repair of a ship's or station's electrical power plant and electrical equipment. They also maintain and repair power and lighting circuits, distribution switchboards, generators, motors and other electrical equipment. Electrician's Mates are employed onboard nuclear powered ships to maintain the control subsystems in nuclear reactors.

Enginemen (EN) operate, service and repair internal combustion engines used to power some of the Navy’s ships and most of the Navy’s small craft. Most enginemen work with diesel engines. Enginemen also operate and maintain electrohydraulic controllable pitch propeller systems and steering engines, refrigeration and air conditioning systems, air compressors, desalinization plants and small auxiliary boilers.

Gas Turbine System Technician are responsible for all gas turbine engines. They maintain propulsion machinery, including gears, shafting and controllable pitch propellers, assigned auxiliary equipment propulsion control systems, electrical and electronic circuitry up to the printed circuit module, and alarm and warning circuitry. They handle administrative tasks related to gas turbine propulsion system operation and maintenance.

HT’s do the metal work necessary to keep all types of shipboard structures and surfaces in good condition. They also maintain shipboard plumbing and marine sanitation systems, repair small boats, operate and maintain ballast control systems, and manage the Quality Assurance Program.

Machinist's Mates are responsible for the continuous operation of the many engines, compressors, gears, refrigeration and air-conditioning equipment along with other types of machinery onboard ships and shore installations. They are responsible for the ship's steam propulsion and auxiliary equipment and the outside (deck) machinery. Machinist's Mates are deployed on-board nuclear powered ships to maintain the machinery and piping in nuclear reactors.

Machinery Repairmen are skilled machine tool operators. They make replacement parts and repair or overhaul a ship's engine auxiliary equipment, such as evaporators, air compressors and pumps. They repair deck equipment, including winches, hoists, condensers and Heat exchange devices. Shipboard Machinery Repairmen frequently operate main propulsion machinery, besides performing machine shop and repair duties.

Steelworkers rig and operate all special equipment used to move or hoist structural steel, structural shapes and similar material. They erect and dismantle steel bridges, piers, buildings, storage tanks, etc. They work with steel shapes, plates and built-up sections used in the construction of overseas facilities. They are skilled in arc welding, MIG welding, TIG welding, and gas welding.