AD vs MR

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On a tender or repair ship: you run the machine shop, fabricating parts and repairing components for every other ship in the task group that needs something the supply system cannot produce overnight. Job orders come in, you read the blueprint or damaged sample, set up the machine, and cut the part. Quality matters — a bad bearing race or a mis-bored shaft sleeve fails at sea. Shore-based billets (shipyards, IMAs) are shift-work industrial environments: scheduled job orders, stricter safety programs, time cards, and union-adjacent culture. Less adventure, more predictability.

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A School at Naval Station Great Lakes (IL) runs approximately 6-8 months. You cover precision measurement and metrology, blueprint reading and GD&T (geometric dimensioning and tolerancing), lathe and milling machine operation, surface grinding, drill press work, metallurgy basics, and heat treatment. The curriculum is legitimately technical — more community college machining program than basic military training. You will spend real time cutting metal and making parts to tolerance before you graduate.

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Moderate. Machine shop work keeps you on your feet all day operating lathes, milling machines, grinders, and drill presses. You handle metal stock, manage coolant and cutting oil, and deal with real injury hazards — chips, sharp edges, rotating equipment, and the occasional heavy casting. Hearing protection is mandatory and still not always enough.

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Machinery Repairman is a genuine trade — you learn precision machining from the ground up and develop real craftsmanship that the civilian workforce values. The recruiter probably does not know the rate well enough to sell it, which cuts both ways. Here is what they will not tell you: the MR community has been shrinking for years as the Navy shifts maintenance from at-sea tenders to shore-based depots and contracted shipyards. Your odds of spending your career on a glamorous surface combatant are low — you are more likely to work in an IMA or shipyard alongside civil service machinists, doing industrial shift work that feels less military and more factory. That is not necessarily bad. The civilian translation for MR is genuinely strong: precision machinists are in demand in aerospace, defense manufacturing, and energy, especially with a TS-eligible clearance and USMAP credentials. But you have to translate it actively — "Navy MR" on a resume does not sell itself the way IT or nuclear propulsion does. Do the work to articulate what you built and to what tolerance, and you will have real options when you separate.