The ship maintenance occupational field includes the Hull Maintenance Technician, Damage Controlman, Machinery Repairman, Molder, Instrumentman, Opticalman, and Patternmaker ratings. In the following paragraphs we will describe these ratings:

Hull Maintenance Technician (HT)

HULL MAINTENANCE TECHNICIANS plan, supervise, and perform tasks to fabricate, install, and repair various structures, shipboard and shore-based plumbing, and piping systems.

Damage Controlman (DC)

DAMAGE CONTROLMEN are qualified in the skills and techniques of damage control, fire fighting, and CBR defense. They must be able to take all measures required to maintain the watertight integrity of the ship. They must also be able to coordinate damage-control efforts and instruct other ratings in damage-control procedures.

Machinery Repairman (MR)

MACHINERY REPAIRMEN make all types of machine shop repairs on shipboard machinery. This work requires skill in using lathes, milling machines, boring mills, grinders, power hacksaws, drill presses, and other machine tools. It also requires skill in using hand tools and measuring instruments usually found in a machine shop. The job of restoring machinery to good working order may range from making a simple pin or link to the complete rebuilding of an intricate gear system. Often, without dimensional drawings or other design information, a Machinery Repairman must depend on ingenuity and know-how to machine a repair part successfully.

Molder (MI.)

MOLDERS operate foundries aboard ship and at shore stations. They make molds and cores, rig flasks, prepare heats, and pour castings of ferrous, nonferrous, and alloy metals. They also shake out and clean castings and pour bearings.

Instrumentman (IM)

INSTRUMENTMEN perform preventive and corrective maintenance and calibration on mechanical instruments and standards and Navy timepieces. They use Navy or mechanical instrument repair and calibration shop (MIRCS) procedures.

Opticalman (OM)

OPTICALMEN perform preventive and corrective maintenance on small navigational instruments, binoculars, gun sights, range finders, submarine and turret periscopes, night vision sights, and other optical instruments.

Pattemmaker (PM)

PATTERNMAKERS make wooden, plastic, plaster, and metal patterns used by Molders in a Navy foundry. They mount patterns on matchboard/match plates for production molding. Patternmakers make master patterns, full-scale layouts of wooden patterns, coreboxes, and templates. They also index and store patterns.