[sweetmtn]

I asked my son about MM's working on weapons, he said he never heard of that nor had he ever met one that did, not saying he was wrong, just never met one. But here is the official MM rating info discription:


Machinist’s Mates (MM)

operate and maintain steam

turbines and reduction gears used for ship propulsion
and auxiliary machinery such as turbogenerators, pumps
and oil purifiers. They also maintain auxiliary machinery
outside of main machinery spaces, such as electrohydraulic
steering engines and elevators, refrigeration plants,
air conditioning systems and desalinization plants. They
may also operate and maintain compressed gas producing

plants.

What They Do
The duties performed by MMs include:
•

Aligning piping systems for oil, water, air and steam,

and controlling the operation of ship boilers and
steam turbines used for ship propulsion and service
systems

•

Controlling operation of turbogenerators used to

produce electrical power

•

Cleaning, adjusting, testing and performing other

preventive maintenance on a ship’s boilers, main
engines, turbogenerators and other auxiliary machinery
including steering engines, elevators, winches,
pumps and associated valves

•

Operating and maintaining desalinization plants

(distilling plants) to make fresh water from sea water

•

Maintaining refrigeration plants, air conditioning

systems and galley equipment

•

Repairing or replacing valves, pumps, heat exchangers,

compressors, steam turbines and hydraulic or
pneumatic control devices

•

Making entries in and analyzing machinery operating
records and reports

Basically as my son puts it, MM's and even nuke MM's are plumbers with REALLY big wrenches!