<Tr> <Th> Specialty </Th> <Td> Engineering / Weapons </Td> </Tr> <P> Machinist's mate (or MM) is a rating in the United States Navy's engineering community . </P> <P> According to the Bureau of Naval Personnel (BUPERS), the job of a Machinist's Mate is to "operate, maintain, and repair (organizational and intermediate level) ship propulsion machinery, auxiliary equipment, and outside machinery, such as: steering engine, hoisting machinery, food preparation equipment, refrigeration and air conditioning equipment, windlasses, elevators, and laundry equipment . Operate and maintain (organizational and Intermediate level) marine boilers, pumps, forced draft blowers, and heat exchangers; perform tests, transfers, and inventory of lubricating oils, fuels, and water . Maintain records and reports, and may perform duties in the generation and stowage of industrial gases ." Enlistees are taught the fundamentals of this rating through on - the - job training or formal Navy schooling . Advanced technical and operational training is available in this rating during later stages of career development . </P> <P> Machinist's Mates (submarine) and Machinist's Mate (surface) generally fall into one of three roles: </P>

What does a machinist mate do in the navy
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