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MRE6

Machinery Repairman

E-6 (Staff Sergeant) · Navy

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

MR1 is the LPO rank and the Chief board preparation rank simultaneously. The LCPO is building your Chief packet while you are running the section. Advanced machining qualifications — cylindrical grinding, precision boring, gear cutting where available — and the Shop Production Supervisor or EOOW-equivalent qualification on a tender or IMA are the two credentials the Chief board looks for that most MR1s never get around to earning.

The Honest MOS Read
You are the LPO of the machine shop or machining section. That means the division officer brief is your product, the eEVALs you write drive the advancement slate, the NSTM 556 compliance posture for everything that leaves the shop is your accountability, and the Chief board conversation is no longer abstract — the LCPO is building the packet with your name on it while you are still running the section. At a ship-board shop on a tender, repair ship, or CVN, or at an IMA production supervisor billet, you manage 5-20 MRs. You triage the work-order queue, assign jobs by machinist competency, execute the complex setups yourself (cylindrical grinding to journal tolerance, multi-surface precision milling, custom fixture fabrication for odd-geometry parts), QA-sign the shop record cards before parts are released, manage the measuring instrument inventory through the calibration cycle, write the section's input to the department maintenance brief, and mentor the MR2s toward NEC pipelines and Chief board preparation. The NSTM 556 technical authority dimension of the MR1 LPO job is what distinguishes the rate from other engineering ratings. The MR1 on a tender is the person the repair activity engineering officer calls when there is a question about whether a borderline part is serviceable or needs replacement. The MR1 who can read the applicable NAVSEA technical manual section, find the tolerance standard, compare it to the measured dimension, and give the engineering officer a firm answer — without escalating — is the MR1 who gets the next complex job assignment and the Chief board recommendation. The Shop Production Supervisor qualification, where available at an IMA or tender, is the credential equivalent to the EOOW qualification in the MM rate. It signifies that you are the senior certified production authority on the deck plate — you can authorize production work, sign quality-control release documentation, and represent the shop at a TYCOM production audit without the division officer present. On a competitive Chief board, the MR1 LPO with the Shop Production Supervisor qual and a clean nonconformance record over two deployments is the candidate who selects. The one without it is competing at a disadvantage. Making Chief in the MR rate is the cultural milestone. The rate is small enough that the goat locker is a working leadership platform with very little margin — every anchor holder is visible to the Chief board, the type command, and the NAVSEA technical authority community. The MR1 who is running toward Chief is the one who is already operating at Chief-level accountability before the anchors go on.
Career Arc
  • 01MR1 LPO designation: section QA authority, division-officer brief ownership, eEVAL writing for MR2s and MR3s.
  • 02Advanced machining qualifications: cylindrical grinding, precision boring, gear-cutting (where available) — the Chief board differentiators.
  • 03Shop Production Supervisor or EOOW-equivalent qualification at IMA or tender — the single strongest career credential for the MR1 board.
  • 04Complex fabrication jobs: propulsion shaft journals, custom valve geometry, precision bearing bores — executed as MR1 and documented.
  • 05Chief board preparation: LCPO building the packet; eEVAL profile and ranking defensible at command level.
  • 06Mentoring MR2s toward NEC pipelines and commissioning paths; producing at least one selectee per year.
  • 07Post-Navy planning started: licensed machinist pathways, NAVSEA/SUPSHIP civilian engineering, defense-industry precision manufacturing.
Common Screwups
  • ×Briefing work-order throughput or nonconformance numbers the LPO has not personally verified. The division officer who catches a discrepancy between the brief and the shop record log remembers it at the eEVAL board. The CHENG who catches it during an availability brief writes the MR1's name in the wrong context.
  • ×Letting a non-conforming part leave the shop because 'the customer needed it tonight.' The customer always needs it tonight; that is not new information. The part that is released outside tolerance and fails in service traces back to the last quality gate — which is the MR1's signature. The schedule pressure that drove the release is not in the JAGMAN report.
  • ×Failing to build the Chief board packet documentation during the MR1 rank period. Chiefs are selected based on the record that exists at the board — not on the potential the LCPO describes verbally. Every advanced machining qual, every mentoring success, every production milestone needs to be in the eEVAL record before the board convenes. Counting on the LCPO to capture it without input is how MR1s become surprised by their non-select.
  • ×Going around the LCPO to the division officer or CHENG on a shop decision. The engineering chain runs through the LCPO; the DCA and CHENG talk in the wardroom, and which path the MR1 chose is part of every conversation after. The goat locker is small in a small rate.

A Day in the Life

  • 0545–0630PT — PRT Good High is the floor; the MR1 who cannot run the course at 0630 is the MR1 whose eEVAL physical readiness trait is the most visible deficiency.
  • 0700–0730Quarters, plan of the day, work-order queue review. MR1 assigns jobs for the day, notes any material shortfalls, updates the status board.
  • 0730–0900Complex job execution — cylindrical grinding setup or precision milling on a propulsion component. MR2 observes; MR1 documents the setup parameters before the first operation.
  • 0900–1000Shop record card review and QA sign-off: review and sign the cards from yesterday's MR2 and MR3 production work. Any borderline dimension gets a second measurement before sign-off.
  • 1000–1100Division-officer brief prep or engineering department sync attendance: work-order status, nonconformance trend, cal status, personnel readiness.
  • 1100–1130Mentoring session with MR2: monthly counseling, eEVAL bullet review, Chief board gap analysis, NEC pipeline status.
  • 1130–1300Noon meal.
  • 1300–1500Production work or training evolution — supervising a complex setup by the MR2, signing a PQS line item, or running a shop floor walk to review work in progress.
  • 1500–1600Administrative: eEVAL input compilation, Chief board packet documentation review, calibration turn-in initiation, brief update.
  • 1600–1700End-of-day status board update; verify all open jobs have a current status note; confirm duty section assignments.
  • 1700–2200Liberty or duty. Duty MR1 is the production authority for any after-hours work orders from the engineering department — the call at 0100 about a casualty-repair job is the MR1's call to respond to.

Weekly Cadence

The MR1's week has three rhythms: production management, quality management, and leadership development. Production management: Monday morning triage and assignment, Wednesday mid-week status update to the division officer, Friday close-of-week shop record audit before the weekend. Quality management: Tuesday instrument calibration log review (30-day alerts actioned), Thursday nonconformance trend review before the weekly brief. Leadership development: monthly counseling with each MR2 (scheduled, not impromptu), quarterly eEVAL bullet compilation with each direct report, annual NEC pipeline review with the career counselor. During availability surge — fleet support for a tender, or a port availability on a CVN — all three rhythms accelerate. The production management rhythm doubles in pace; the quality management rhythm must hold its standard regardless of pace; the leadership development rhythm compresses to the essentials (monthly counseling still happens, annual reviews may slip). The MR1 who can hold the quality standard during surge is the one who has built habits in the steady-state that survive acceleration.

Key Skills — How to Drill Each

  1. 01
    Run a shop-level work-order program — triage, assignment, material requisition, QA sign-off — with daily cadence the division officer can brief without rewriting.
    The work-order program is a production management function, not just a queue. Triage by urgency (ship-critical vs. planned maintenance vs. improvement work), by complexity (assign to the MR level the job requires), and by material availability (do not assign a job before the material cert is in hand). Update the status board daily — the division officer's brief should always be buildable from the current board without a special data-gathering effort. The board that is two days stale when the division officer walks in is the board that makes the MR1 LPO look like a production manager who is behind his own queue.
  2. 02
    Execute advanced machining setups: four-jaw chuck for eccentric work, dividing head for gear cutting, lathe tailstock offset for taper turning, cylindrical grinder for finish journal work.
    Document every non-standard setup in the job record — fixturing method, offset values, approach parameters, inspection sequence. The documentation serves two purposes: quality record for the current job, and setup reference for the next machinist who runs the same part. The MR1 who builds setup documentation for complex jobs is building institutional knowledge that the shop does not lose when the MR1 transfers. The one who runs complex setups from memory and documents only the final dimensions leaves the shop less capable than it was.
  3. 03
    Own NSTM 556 compliance posture for the section — governing tolerances, documentation requirements, nonconformance reporting, borderline part disposition.
    At MR1 you are the person the repair activity engineering officer comes to with a tolerance question. Know Chapter 556 well enough to give a disposition answer without opening the document — and know where the document is when the answer requires verification. The MR1 who says 'let me verify that in Chapter 556 before I give you a firm answer' is demonstrating professional discipline. The one who gives a confident answer that is wrong is creating a ship casualty.
  4. 04
    Defend the section's readiness brief to division officer, CHENG, and XO — throughput, nonconformance rate, cal status, personnel readiness — without the wardroom rewriting the numbers.
    The brief is a product. Produce it on a schedule, not on demand. If the division officer walks in on a Wednesday and the brief is current as of Tuesday's close of business, the MR1 LPO is doing the job. The brief that gets rewritten by the wardroom because the numbers were wrong, stale, or incomplete is the brief that damages the MR1's eEVAL trait for professional competence.
  5. 05
    Mentor an MR2 from mid-career toward Chief board competitiveness — eEVAL bullets, advanced quals, NEC pipeline.
    The mentoring conversation has three components: the record audit (what is actually in the eEVAL history, what quals are signed, what pipeline actions are documented), the gap analysis (what the Chief board will see as missing given the current record), and the action plan (specific milestones with deadlines for closing the gaps). Have this conversation at every monthly counseling with each MR2, not as an annual summary. The MR2 who receives monthly mentoring toward a specific Chief board target advances; the one who receives annual summaries does not.
  6. 06
    Write an eEVAL block the senior rater can defend at a ranking board — measurable accomplishments, named outcomes.
    The eEVAL bullet format is: action verb + specific object + quantified result. 'Maintained section instrument calibration at 100% over 14-month deployment cycle spanning 23 port visits' is a bullet. 'Maintained calibration standards' is a phrase. Every bullet in block 40 should be defensible with a shop record, a calibration log, or a work-order report. The senior rater who is defending an EP recommendation in a ranking board needs specific data to defend it; the LPO who provides specific data gets the ranking.

Manuals & References — What Chapters Matter

  • NSTM Chapter 556 — Machinery Repair
    At MR1 you are the senior enlisted technical authority on this document for the section. Know the nonconformance disposition section, the documentation requirement section, and the allowable tolerance section well enough to give a firm answer to an engineering officer question without opening the volume. Know which sections require technical authority review before disposition and which the LPO can resolve independently.
  • NSTM Chapter 505 — Piping and Plumbing
    The flanges, fittings, and piping components the section fabricates have standards in both Chapter 556 and Chapter 505. The MR1 who knows which chapter controls which feature on a given job is the one who does not release a flange-face part that meets Chapter 556 but violates Chapter 505's gasket-seating surface requirement.
  • NAVSEA S9086-series Technical Manuals and platform-specific NAVSEA drawings
    The OEM tolerances for the parts the section fabricates for propulsion and auxiliary systems. At MR1 you are expected to locate the relevant technical manual section before running a production job on a propulsion component, not after. The CHENG who asks 'what does the NAVSEA drawing say about the journal tolerance?' should never be waiting for the MR1 to find the document.
  • OPNAVINST 4790 series — 3M / PMS policy and NAVSEA Quality Management System requirements
    At MR1 you own the PMS compliance posture and the QA framework for the section. The TYCOM production audit and the INSURV inspection both reference these documents. Know what a valid corrective action document looks like, what a properly closed nonconformance record requires, and what the INSURV inspector will pull during a PMS spot-check.
  • NAVPERS 18068 + current NEC source-rating NAVADMIN
    At MR1 you are building NEC pipeline packets for MR2s. Use the current NAVADMIN, not last cycle's. Pipeline durations change, prerequisites change, and the NEC your MR2 is planning around may have moved to a different source rating. The MR1 who advises off current information is the one who gets the successful pipeline selectee.
  • OPNAVINST 6110.1 — PRT / BCA
    You own the section's physical readiness posture and you live the standard. The MR1 LPO who fails PRT while managing a section's advancement slate is the MR1 LPO who is not selected for Chief. It is that simple in the MR rate.

Standards — How to Hit Each

  • Chief board packet under construction — eEVAL profile, advanced quals, production output documented.
    Pull your own eEVAL archive and read it the way the Chief board will read it. What quals are signed and documented? What specific production accomplishments are in the block 40 narrative? What mentoring results are documented? The board sees the record, not the potential. Build the record during the MR1 rank period, not the year before the board.
  • Shop work-order throughput and nonconformance rate defensible at CHENG / XO level every cycle.
    Track the nonconformance rate by quarter — how many parts were returned and why. If the rate is increasing, find the root cause before the division officer asks. If it is decreasing, document the reason in the brief (new QA procedure, additional MR3 training, different QA sequence). The MR1 who owns the trend data proactively is the one who briefs it confidently. The one who discovers the trend when the division officer asks is the one who looks like a production manager who is not reading the own shop's data.
  • Measuring instrument calibration 100% current at every TYCOM, INSURV, or production-audit inspection.
    The MR1 who has zero out-of-cal instruments at every inspection is the one who tracks proactively, not reactively. The 30-day alert rule: any instrument due within 30 days goes on the turn-in list today. The IMA metrology lab turnaround varies — build a buffer before the due date, not a margin after it.

Technical Mistakes — Concrete Consequences

  • Briefing production metrics that have not been personally verified.
    The CHENG who discovers a discrepancy between the MR1's brief numbers and the actual shop record during an inspection visit does not forget it. The eEVAL that follows covers the inspection period, and the trait for professional competence reflects what the chain of command observed. A false brief — even an inadvertent one — is harder to recover from than a brief that honestly acknowledged a problem.
  • Releasing a non-conforming part under production pressure.
    The part that fails in service traces to the last QA gate. The MR1's signature is the last QA gate. The production pressure that drove the release is not documented in the JAGMAN; the signature is. The division officer who signed off on the schedule will not be in the investigation with the MR1.
  • Treating the Chief board packet as something the LCPO manages.
    The LCPO builds the packet from the record that exists. If the record is thin on advanced quals, the packet is thin on advanced quals. The MR1 who assumes the LCPO will advocate persuasively for a record that does not show the Chief board criteria is the MR1 who is surprised by a non-select. Build the record; let the LCPO describe it.
  • Going around the LCPO to the division officer or CHENG on a production or personnel dispute.
    The goat locker in the MR rate is small. The CHENG and the division officer talk. The path the MR1 took to raise a concern is part of every conversation that follows, including the eEVAL board, the Chief selection board narrative, and the next command tour recommendation. Take it to the LCPO first, always.

Career Decisions at This Rank

  • Advanced machining quals (cylindrical grinding, gear cutting) now vs. never.
    The MR1 who does not have advanced machining credentials when the Chief board meets is competing against MR1s who do. The tenders, IMAs, and repair ships that have cylindrical grinding equipment are the billets to request. If the current assignment does not have the equipment, request the next billet specifically to acquire the credential. The right time for this conversation is the assignment conversation two years out, not the month before the board.
  • Shop Production Supervisor qualification at an IMA vs. EOOW-equivalent at a tender.
    Both credentials signal the same thing to the Chief board: this MR1 is operating at the senior production authority level, not just the section LPO level. The IMA Shop Production Supervisor and the tender's equivalent qualification are the same credential in different settings. If the current assignment offers one, pursue it. If neither is available, document why in the LCPO-counseling record so the next billet request can address the gap.
  • Post-Navy precision manufacturing career vs. NAVSEA/SUPSHIP civilian career vs. defense contractor.
    The MR rate's technical credential has three civilian translation paths: precision manufacturing (machinist/production supervisor/quality manager at a defense or commercial precision shop — typically $70,000–$120,000 for a senior machinist with military QA background), NAVSEA or SUPSHIP civilian engineering support (GS-09 to GS-13, technical authority support for ship repair and modernization), or defense-contractor precision manufacturing and quality management (similar salary range, often requiring a clearance). The NAVSEA/SUPSHIP path is the one that most directly extends the military career arc; start building the relationships during the MR1 period, not the retirement period.

How the Seat Varies by Unit Type

  • Tender (AD / AS)
    The highest-production LPO billet in the MR rate. Multi-customer fleet support, diverse material, urgent timelines, and a TYCOM visibility that a ship-board shop does not have. The MR1 LPO on a tender is the one the repair activity commander knows by name — for the right reasons or the wrong ones. The performance record here is the Chief board record.
  • IMA
    Broader machine-tool inventory, Shore Intermediate Maintenance Activity management, and access to the Shop Production Supervisor qualification. The IMA MR1 is competing with a larger peer group for advancement but has access to advanced equipment and credentials that a ship-board MR1 does not. The IMA LPO who earns the Shop Production Supervisor qual has the most competitive Chief board package in the rate.
  • Repair ship (AR / ARS)
    Smaller crew, more independent senior-enlisted role, and the MR1 LPO may be the only credentialed machinist production authority on the hull. More direct relationship with the engineering officer, less peer group competition, and faster visibility to the command level. The downside: limited peer mentoring and no advanced machine-tool access on most repair ships.

What Good Looks Like at This Rank

The high-performing MR1 is the LPO the CHENG names when the repair activity commander asks who the section's best production authority is. The brief never has a caveat the division officer has not already heard from the MR1; the shop record archive for the last 18 months shows a consistent nonconformance rate at or below command average; and the MR2 the MR1 has been mentoring for two years just submitted a Chief board packet. The observable behaviors on a given Tuesday morning: the status board is current from yesterday's close, the cal-due tracker has zero instruments within 30 days of expiration without an in-process turn-in, and the MR1 knows without looking which MR3 is on which job and what the current status is. The LPO who walks into the shop and has to ask the MR2 what the MR3s are working on is the LPO who is managing from behind the production. The thing the chief's mess talks about when the MR1 is in the Chief board selection conversation: not a single dramatic job, but the reliability of the record over time. The MR1 who selects for Chief in the MR rate is the one whose shop record archive is the production supervisor's answer when the type command asks for a best-practice example.

Preview — The Next Rank

Making Chief in the MR rate changes the job description permanently: the goat locker is a working leadership platform, the deckplate reads the machining standard off how the Chief walks the shop at 0600, and the division officer comes to the Chief with the production question rather than the other way around. The eEVALs the Chief writes are the ones that decide which MR1 makes Chief next — which means the quality of the mentoring the Chief provided during the MR1 years is directly visible in the next cohort's board results.
FAQ

MR E6 — Frequently Asked Questions

Q01What does a E6 MR (Machinery Repairman) actually do?
You are LPO of the machine shop — ship-board on a tender, repair ship, CVN, or LHD, or the production-supervisor equivalent at an IMA or ship repair facility.
Q02What's the most important thing to know as a E6 MR?
MR1 is the LPO rank and the Chief board preparation rank simultaneously.
Q03What does a typical day look like for a E6 MR?
Time-blocked day at the E6 MR rank tier: 0545–0630 PT — PRT Good High is the floor; the MR1 who cannot run the course at 0630 is the MR1 whose eEVAL physical readiness trait is the most visible deficiency, 0700–0730 Quarters, plan of the day, work-order queue review. MR1 assigns jobs for the day, notes any material shortfalls, updates the status board, 0730–0900 Complex job execution — cylindrical grinding setup or precision milling on a propulsion component. MR2 observes; MR1 documents the setup parameters before the first operation,…
Q04What mistakes get E6 MR soldiers fired or relieved?
Briefing work-order throughput or nonconformance numbers the LPO has not personally verified. The division officer who catches a discrepancy between the brief and the shop record log remembers it at the eEVAL board. The CHENG who catches it during an availability brief writes the MR1's name in the wrong context; Letting a non-conforming part leave the shop because 'the customer needed it tonight.' The customer always needs it tonight; that is not new information.…
Q05What career decisions matter most at the E6 MR rank tier?
Advanced machining quals (cylindrical grinding, gear cutting) now vs. never — The MR1 who does not have advanced machining credentials when the Chief board meets is competing against MR1s who do. The tenders, IMAs, and repair ships that have cylindrical grinding equipment are the billets to request. If the current assignment does not have the equipment, request the next billet specifically to acquire the credential. The right time for this conversation is the assignment conversation two years out, not the month before the board; Shop Production Supervisor qualification at an IMA vs.…
Q06What's next after E6 for a MR (Machinery Repairman) in the Navy?
Making Chief in the MR rate changes the job description permanently: the goat locker is a working leadership platform, the deckplate reads the machining standard off how the Chief walks the shop at 0600, and the division officer comes to the Chief with the production question rather than the other way around.
Q07What manuals and regulations does a E6 MR need to know cold?
NSTM Chapter 556 — Machinery Repair: the governing manual you now enforce; you are the LPO the repair-activity technical authority comes to with a borderline tolerance call.; NSTM Chapter 505 — Piping and Plumbing: flanges, fittings, and piping components; know which chapter owns the tolerance before the technical authority asks.; NAVSEA S9086-series Technical Manuals and platform-specific NAVSEA drawings: propulsion shaft tolerances, bearing bore specs,…

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Published by the Honest MOS Editorial DeskVerified against DoD/.gov sourcesUpdated May 2026Editorial standards