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GME5

Gunner's Mate

E-5 (Sergeant) · Navy

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

GM2: you are the working senior GM — the GM3s call you LPO whether the watchbill says so or not, and your initials on their maintenance and custody documentation are the standard the section is graded against. The weapons chief is mentoring you toward anchors. The non-negotiable holds at every rank: a single lost weapon or one unreconciled round count erases everything else on the record, so the report-it-now reflex is not just yours to keep — it is yours to enforce on every GM3 below you.

The Honest MOS Read
You are a Gunner's Mate Second Class, and you are the working senior GM on the maintenance bench, in the armory, and on the gun line. The GM3s call you LPO whether the watchbill says so or not, the weapons chief is mentoring you toward anchors, and the ship's weapons readiness and AA&E integrity ride directly on whether your section runs clean. The GM3 was the technician who got reviewed; the GM2 is the technician who reviews — you own the complex fault diagnosis, and you check the GM3's work before it reaches QA. Your initials are the standard now. You run a section of the ship's weapons maintenance — the gun-mount and CIWS work center, the armory and small-arms program, the magazine and ammunition-handling section, or the missile and launching-system support — and you are the senior technician who either owns the fault or reviews the GM3's product. On a DDG mid-workup that means fault-isolating a Mk 45 gun-mount hydraulic discrepancy before a live-fire, clearing a CIWS gun stoppage the gunnery team has been working around, or running a magazine offload onto a barge under explosives-handling procedure. The fault isolation starts at the NAVSEA technical manual for the system and the specific symptom — not at the parts shelf — because chasing a fault with component replacement instead of procedure is how an intermittent gun-mount or CIWS fault keeps coming back, costs the supply system, drags the weapons readiness brief, and lands your section in a QA review. You are the armory custodian of record for a chunk of the ship's AA&E. You own the serial-number reconciliation, the round accountability, and the access-list control, and you are the one who reports it up the instant a count does not match. At GM2 that reflex is no longer just yours to keep — it is yours to enforce. The GM3 who tries to quietly resolve a discrepancy before reporting it learned that habit from someone; your job is to make sure he learned the opposite from you. Letting access lists or custody turnovers drift because "everyone knows everyone" is exactly the lapse the AA&E assessment finds first, and a stale access list is a security-control failure with your section's name on it. You train and qual-sign two to four GM3s and GMSNs, build the section's training plan, and run the ship's small-arms qualification program under OPNAVINST 3591.1 as the program manager — schedule, range safety, scoring, OPNAV 3591/1 records, and the crew's currency status the weapons officer is held to. You review the GM3's maintenance and custody documentation before QA sees it, catching the incorrect MRC step, the missing reference, and the unreconciled count so the section's rework and discrepancy rate stays below the command average. And when a weapons-system discrepancy or a magazine-safety issue needs to go up, you brief the Weapons Officer, the Gunnery Officer, or the Combat Systems Officer in terms a watch-section officer understands: what the system was doing, what the fault indicates, the fix timeline, and the safety implication. That brief is a decision-support product, not a technical monologue — the officer needs to know whether the ship can conduct the scheduled evolution, the restoration timeline, and the backup posture in the interim. The NWAE for GM1 is no longer abstract, and the eEVAL ranking against your peer GM2s starts to matter for the next advancement slate. Pull the current NEC source-rating NAVADMIN before quoting any specific code to your GM3s — you are mentoring their packets now, and advice from a superseded NAVADMIN sends a sailor down a closed pipeline. And the weapons chain runs through the chief: going around the LCPO to the Weapons Officer is the bypass the command master chief hears about the same day, and your Chief packet feels it at the next ranking. The goat locker is deciding whether you carry yourself like a Chief before the board ever reads the record.
Career Arc
  • 01GM2 pin-on via NWAE from GM3 — the NEC progress, the warfare device PQS, and a clean AA&E accountability history were the floor to get here.
  • 02Section lead in a weapons work center: armory custodian of record for a chunk of the ship's AA&E; your initials on the GM3s' maintenance and custody documentation; the section's rework and discrepancy rate is now your name.
  • 03Complex fault-isolation ownership: first weapons-system faults diagnosed from the NAVSEA technical-manual procedure rather than the abbreviated version, system back in readiness with QA-clean documentation.
  • 04Small-arms qualification program run as program manager under OPNAVINST 3591.1 — schedule, safety, scoring, records, and the crew's currency the weapons officer is held to.
  • 05NWAE for GM1: BIB pulled from the current cycle, study log documented and current, LPO briefed at monthly counseling before the advancement window closes.
  • 06Advanced or second NEC in conversation with the LCPO; Surface Warfare device pinned; a Navy COOL armorer or ordnance credential complete or in final exam stage.
  • 07Chief Petty Officer board eligibility timeline discussed with the LCPO — the GM2 who starts the Chief-packet conversation before the LCPO brings it up is the one the goat locker is watching.
Common Screwups
  • ×A lost weapon or an AA&E accountability failure in your section — including one you allowed by letting a GM3 carry the custody program unsupervised, or by rubber-stamping a reconciliation you did not verify. At GM2 you are the custodian of record; the discrepancy is your name at the captain's mast even when another sailor signed the line. One lost weapon erases every clean rework rate, every qualified GM3, every readiness number on the record. There is no other single event in the rate with that gravity.
  • ×Rubber-stamping GM3 maintenance or custody documentation without actually reading it. Your initials are the standard. When QA or the AA&E inspection finds the error on a closed MRC or an unreconciled custody line after you signed it, the trend lands under your name at the Type Commander assessment — and the GM3 who learns the pre-QA review is procedural keeps making the same error. The section's standard is exactly what you enforce by actually reviewing.
  • ×NJP or DUI at GM2. The career impact is immediate and cumulative: advancement flag, eEVAL damage, NEC pipeline freeze, clearance review, and your leadership credibility with the GM3s destroyed in a department small enough that everyone knows by the next working day. The Chief board's first filter is integrity, and an NJP at E-5 is the kind of mark a sitting Chief would not defend for his own mess.
  • ×Going around the LCPO to the Weapons Officer or the XO on a section or personnel matter. The weapons chain runs through the chief; the command master chief hears about the bypass the same watch rotation, and the goat locker reads it as 'not yet a Chief.' One documented bypass tells the mess everything it needs to know about whether you understand how the chain works.
  • ×Letting the NWAE for GM1 become a background concern while the section runs hot. The advancement slate is a fixed calendar, not a function of when the workup ends. The GM2 who enters the GM1 cycle without a documented study log is competing against GM2s who built the habit across the entire tenure — and the eEVAL ranking the LCPO defends at the worksheet review is built across the whole period, not the last six weeks.

A Day in the Life

  • 0530Wake up. Check the ship's maintenance management system and the overnight armory and magazine watch turnover for weapons write-ups, a magazine condition, or a custody note needing the GM2's attention — the items the weapons chief or the GMS may ask about at quarters.
  • 0600PT formation. The GM2 sets the section's PT standard by showing up and finishing strong, not by fading at the back. Weapons-department PT on the pier or flight deck is a department-visible event.
  • 0700Post-PT hygiene, chow, utilities on. Review the section's PMS schedule: which MRCs are assigned to GM3s, which require the GM2's authorization level or witness, which need a system or magazine condition. Pull the calibration sub-account status — flag anything due in the next 30 days.
  • 0800Quarters. GM2-level information includes the day's PMS assignments and the weapons readiness input — system availability, deferred maintenance, AA&E and magazine-safety posture, small-arms currency, any new write-ups affecting the readiness metrics. Note which GM3 is on which action.
  • 0830Pre-maintenance walk of the work center and armory: verify the GM3s have the correct MRC cards, calibrated test equipment is in cal for measurement actions, classified weapons documentation is signed out, and the magazine condition is correct for any scheduled action. The five-minute walk prevents the three-hour mid-evolution problem.
  • 0900PMS execution block. Manage the section: witness GM3 evolutions requiring the GM2's authorization, run independent fault isolation on complex write-ups, and review in-progress documentation before it becomes a QA return. The GM2 running his own maintenance while supervising GM3s is managing a production floor, not a single workbench.
  • 1130Pre-chow sub-account and custody check: every weapon and tool signed in, calibrated sets accounted for, custody records reconciled, no 3-M action left open mid-execution. Brief the GM3s on afternoon assignments.
  • 1300Afternoon block: run or supervise a small-arms qualification range as program manager, witness GM3 PQS line items, or review and submit the morning's 3-M documentation to QA. Manage the crew's small-arms currency picture so the weapons officer has it accurate on demand.
  • 1500NWAE study: 45-60 minutes, the GM1 BIB section, documented in the study log. The GM1 advancement cycle is a fixed-calendar competition; the GM2 who builds the daily habit now is structurally ahead of the one who plans to study when the tempo allows.
  • 1600End-of-day accountability: all weapons and tools signed in, calibrated sets logged, custody records reconciled, classified documentation secured, magazine and armory spaces squared, open 3-M statuses updated. Brief the LCPO on section status — if anything is not where it should be, the LCPO hears it from you, not at the morning brief.
  • 1730Released on non-duty days; if on duty, stand the assigned armory, magazine, or weapons watch. Navy COOL armorer or ordnance credential prep on personal time — the GM2 who completes a civilian credential before GM1 pin-on starts the post-Navy market profile now.
  • 2000Review the next day's PMS and watch schedule; flag MRCs that require the GM2 to arrange a system or magazine condition or a supporting party. The GM2 who shows up at quarters with the next day's production planned is the one the LCPO stops pre-planning for.
  • 2200Lights out. Workup, live-fire, and ammunition onload cycles extend every block — the GM2 who runs a clean section in port holds the same standard underway, because the habits hold under pressure and the magazine check never gets shorter for the schedule.

Weekly Cadence

The port-period week at GM2 is structured around the PMS cycle, the weapons readiness reporting cadence, and the small-arms and ordnance evolution calendar. Monday is the planning day: the week's MRC assignments come off the ship's maintenance management system after stand-down, weekend write-ups are in the 3-M queue, and the GM2's section accountability — calibration sub-account, AA&E custody, classified documentation, GM3 PQS status — is reconciled at the start of the week, not the end. The GM2 who shows up Monday with Friday's sub-account already closed and the GM3 training status updated is the one the LCPO can skip in the morning planning conversation because the section is self-managing. Tuesday through Thursday are the production core. PMS execution runs in the morning; the GM2 divides time between independent fault isolation, GM3 documentation review, PQS witnessing, and managing the small-arms qualification program. A range day puts the GM2 in the program-manager seat, and an ammunition onload or offload makes the explosives-handling evolution the priority, with the GM2 supervising the working party under NAVSEA OP 4/OP 5 governance. The weapons readiness input — system availability, deferred maintenance, AA&E posture, small-arms currency — is built from real-time data across the week, so the GM2 who tracks the section's metrics in real time never scrambles to produce accurate numbers at the weekly brief. A department-level maintenance sync or QA trend review typically lands midweek, where the section's rework and discrepancy data is visible and the GM2 whose section is below the command average is the one the LCPO points to as the standard. Friday is close-out: PMS completions reconciled, calibration due-dates flagged for the coming weeks, open write-ups status-updated, custody records and magazine-safety posture squared, and the monthly counseling input prepared for the LCPO. The GM2 who brings a section training-status update, a calibration and custody status, and an NWAE study-log update to the counseling is delivering the data the LCPO needs to write the eEVAL input. Deployed operations and workup cycles compress this rhythm into the watch rotation and the maintenance and ordnance production schedule — and the difference between the GM2 who thrives and the one who loses ground is the documentation, calibration, and AA&E accountability discipline built in garrison. Deployed habit equals garrison habit under pressure, and in this rate the cost of letting that discipline slip is not a rework trend — it is the lost weapon that erases the record.

Key Skills — How to Drill Each

  1. 01
    Own a complex weapons-system fault from write-up through fault isolation through corrective action on the Mk 45 gun mount, CIWS Mk 15, or launching and handling system — system back in readiness with 3-M documentation closing clean before the next evolution.
    Start at the NAVSEA technical-manual fault-isolation section for the system and the specific symptom, not at the LRU shelf — the branching logic may show the root cause is not the component the GM3 initially suspected. Read the full procedure before touching hardware, document each isolation step and the result observed so the corrective-action entry reconstructs the diagnostic path without a verbal explanation, and verify the post-action check before closing the discrepancy. The GM2 who can run this on a major weapons system without calling the LCPO in for technical backup is the one the weapons officer trusts to run the section unsupervised — and the one who chases the fault with parts replacement is the one whose section generates recurring faults and supply-system churn the LCPO has a different conversation about.
  2. 02
    Run the ship's AA&E accountability as a senior custodian — serial-number reconciliation, round count, access-list control, custody turnover — and own and enforce the report-it-now reflex when a discrepancy surfaces.
    Reconcile to the serial number and the round count personally, keep the access list current and controlled rather than letting it drift on familiarity, and run a disciplined custody turnover every relief. Then teach and enforce the reflex on your GM3s: the instant a count does not match, the response is stop, secure, report — never locate it quietly first. Audit your section's custody records on your own schedule, not just before an inspection, because the AA&E assessment finds the stale access list and the unreconciled count first, and a discrepancy in your section is your name at the mast. The GM2 whose custody history is unbroken across a custody cycle is the one the LCPO hands the deployment armory program to.
  3. 03
    Run a section training plan that keeps GM3s progressing on PQS, NWAE study, and practical proficiency — and accountability discipline — without requiring the LCPO to supervise every milestone.
    Build the plan at the section level: for each GM3 and GMSN, know their current PQS line-item status, their NWAE BIB progress, their practical qualification gaps, and whether their custody and magazine-check discipline is solid. Put it on a calendar with specific milestones and bring the section training status to the monthly counseling before the LCPO asks. Your sailors should be visibly ahead of the peer cohort on PQS and NWAE — that is the evidence the LCPO uses to describe the section's training production at the department head's readiness brief. The GM2 who lets a GM3's PQS stall for two months without intervening is leaving the section's training output on the LCPO's plate.
  4. 04
    Review GM3 maintenance and custody documentation before QA sees it — catch the incorrect MRC step, the missing reference, the unreconciled count — so the section's rework and discrepancy rate stays below the command average.
    The pre-QA review is not a signature ritual. Read the corrective-action entry against the MRC and the custody line against the inventory: does the description match the work, is the technical reference correct, is the post-action check documented, does the count reconcile to the serial number. When you find an error, explain to the GM3 what the specific provision requires and why — not just 'fix this' — because the GM3 who understands the standard stops making the error, and the one who gets corrections without explanation keeps making it in different formats. Your rework and discrepancy rate is the section's rate; building the GM3's documentation and accountability skill is the only sustainable way to hold it below the command average.
  5. 05
    Run the ship's small-arms qualification program under OPNAVINST 3591.1 as the program manager — schedule, range safety, scoring, OPNAV 3591/1 records, and the crew's currency the weapons officer is held to.
    Manage the program, not just the range day: track the whole crew's qualification currency, schedule re-quals before currency lapses, build and enforce the range-safety SOP, and keep the OPNAV 3591/1 records clean and audit-ready. The weapons officer is held to the crew's small-arms currency, and the GM2 who hands him a current, accurate currency picture — rather than a scramble before an inspection — is the one who runs the program without being checked. Run every range from the safety brief out and account for every round; a negligent discharge or a missing round on a range your program ran is a safety and custody incident in the same afternoon.
  6. 06
    Brief a weapons-system discrepancy or a magazine and explosives-safety issue to the Weapons Officer, Gunnery Officer, or Combat Systems Officer in terms the watch-section officer understands.
    The officer brief is a decision-support product. The officer needs to answer: can the ship conduct the scheduled mission profile with the system in its current condition, what is the timeline to restoration, and what is the backup posture in the interim. Translate the technical fault into operational terms — 'the gun mount has a hydraulic fault that puts it in degraded status; manual-mode firing is available, expected restoration is four hours assuming the replacement part is in the spares locker.' That brief takes ninety seconds and gives the officer everything he needs to advise the TAO. The GM2 who walks in and opens with fault codes and manual references has already lost the room — and on a magazine-safety issue, lead with the safety implication, not the procedure number.

Manuals & References — What Chapters Matter

  • OPNAVINST 5530.13 series — Navy AA&E physical security (verify current series)
    At GM2 you own the custody program for your section, including the access-list and reconciliation provisions you enforce on your GM3s — not just the provisions your own watch falls under. When you return a GM3's custody documentation, you should be able to name the specific provision violated, and when the AA&E assessment audits the section, it asks the GM2 to explain the program, not the GM3. The access-list control and turnover provisions are the ones the assessment finds drift in first, so know them at the level you enforce them.
  • NAVSEA OP 5 / NAVSEA OP 4 and the Navy Explosives Safety Management Program instruction (OPNAVINST 8020.14 series — verify current revision)
    At GM2 you are accountable to the explosives-safety governance at the section level, not just the watch level — you run the magazine offloads, supervise the handling evolutions, and contribute to the section's explosives-safety posture. Know the magazine-safety, stowage, compatibility, and self-assessment provisions at the level the assessment uses them, because the shortcut on an onload or the skipped magazine check surfaces under your section's name, and the consequence of getting explosives handling wrong is not a writeup.
  • OPNAVINST 3591.1 series — Small Arms Training and Qualification (verify current series)
    At GM2 you manage the program, not just qualify on it. Know the qualification-currency requirements for the whole crew, the range-safety governance, the scoring standard, and the OPNAV 3591/1 documentation and reporting requirement — because the weapons officer is held to the crew's currency and the GM2 program manager owns the accurate picture. The provisions you manage to are the ones the inspection checks the program against.
  • OPNAVINST 4790.4 series — Ships' 3-M Systems Procedures Manual (verify current series)
    At GM2 you enforce the 3-M QA provisions your GM3s execute inside, which means knowing the QA sections at the level the quality-assurance division uses them — not just the sections your own actions fall under. When you return a GM3's documentation for rework, name the specific provision the entry violated rather than saying it 'looks wrong,' and know the tool-control and calibration provisions because a slipped calibration date contaminates every measurement the section produced since the last valid date.
  • NAVSEA technical manuals for your ship's weapons systems (Mk 45 gun, CIWS Mk 15, launching and handling gear)
    At GM2 you own the technical content of the fault-isolation procedures for your section's systems — you are the senior technician the GM3 calls when the procedure branches beyond his authorization. Know the fault-isolation sections for the systems you are most likely to be called on: where the fault tree branches, the symptom-to-component mapping, and what corrective action is authorized at your maintenance level versus what requires higher authority. The GM2 who can navigate the technical manual without asking the LCPO is the technical authority the weapons officer signs behind.
  • NAVPERS 18068 Vol II + current GM-rate source-rating NAVADMIN, and the NWAE BIB for the GM1 cycle (MyNavyHR/NETC)
    At GM2 you mentor GM3s through their NEC packets, so your advice must come from the current source-rating NAVADMIN, not your own conversation three years ago — a GM3 who acts on advice from a superseded NAVADMIN and misses a pipeline window remembers whose advice he followed. Pull the current BIB the week it publishes for your own GM1 cycle and build a documented study plan off the current cycle, not the version on the shared drive.

Standards — How to Hit Each

  • Zero AA&E accountability discrepancies attributable to your section over a custody cycle — the GM2 custodian who loses track of a weapon or a round count does not stay a GM2 for long.
    Reconcile personally, keep the access list controlled, run disciplined turnovers, and audit the section's custody records on your own schedule rather than waiting for an inspection. Enforce the report-it-now reflex on every GM3 and verify they have it by how they handle a real discrepancy, not by how they recite the procedure. The standard is binary because the consequence is binary: a single lost weapon or unreconciled count erases everything else on the record, and at GM2 the discrepancy is your name even when another sailor signed the line.
  • Section QA rework rate at or below command average — your initials are on the documentation your GM3s produce after you review it.
    Track the section's rework rate yourself; do not wait for the QA division's trend report. Every time a closed action comes back, document the provision violated, the correction, and the root-cause habit the GM3 needs to change — and if the same type of error returns twice from the same GM3, the next step is a documented counseling, not just a re-do. The trend the Type Commander uses at the assessment is built from the same data you can see in real time; the GM2 who sees the trend forming and intervenes early never shows up on the finding.
  • Small-arms qualification program run to standard under OPNAVINST 3591.1 — schedule, safety, scoring, records, and crew currency the weapons officer is held to, with zero safety incidents.
    Manage the currency picture proactively — schedule re-quals before they lapse, keep the OPNAV 3591/1 records audit-ready, and enforce the range-safety SOP without exception. Hand the weapons officer an accurate currency status on request rather than a pre-inspection scramble. Run every range from the safety brief out and account for every round, because a negligent discharge or a missing round on your program is a safety and custody incident the weapons officer briefs the CO about — and a program with a clean safety record is the one the LCPO lets you run without checking.
  • NWAE for GM1 prep on the LCPO's timeline; advanced or second NEC in conversation; Surface Warfare device pinned; PRT Good Medium or better, BCA in standard.
    Pull the current BIB the week it publishes, build a study calendar with specific daily section targets, log each session, and bring the log to the monthly counseling so the LCPO can defend the FMS at the worksheet review. Bring the NEC conversation with the current source-rating NAVADMIN already read and a written preference on whether to deepen the current track or broaden to a second NEC. Pin the SW device. Train three runs and two strength days a week for a Good Medium-or-better without peaking, because the Good High adds the FMS points the competitive eEVAL ranking turns on.
  • eEVAL trait average and ranking supporting an EP or MP recommendation; your LCPO knows your number before the EVAL board reads it.
    The eEVAL ranking is set by the cumulative record — section QA rework rate, AA&E accountability history, GM3 PQS production, NWAE study progress, NEC pipeline activity, warfare device, small-arms program record, and zero integrity incidents. Talk to the LCPO at every monthly counseling about your standing relative to your peer GM2s, at the midpoint and the end of the period. Do not be surprised by the outcome — the GM2 who is surprised by the eEVAL was not having the counseling conversation, and the eEVAL that is not a surprise is the one you can make accurate Chief-board decisions from.

Technical Mistakes — Concrete Consequences

  • Rubber-stamping GM3 maintenance or custody documentation without actually reading it — initialing the pre-QA review as a ritual rather than a substantive review.
    QA or the AA&E inspection finds the error on the closed action or the unreconciled custody line, and the trend climbs under your section. Your initials are on the reviewed documentation, so the finding is under your name at the Type Commander assessment, not the GM3's. Worse, the GM3 who submits an error you should have caught has learned the review is procedural, and the next submission has the same error. The section's standard is exactly what the GM2 enforces by actually reviewing — and on a custody line, the rubber stamp is how a quiet discrepancy becomes a lost-weapon report.
  • Chasing a weapons-system fault with parts replacement instead of the fault-isolation procedure — swapping components until the symptom stops.
    An intermittent gun-mount or CIWS fault that keeps coming back because the isolation was abbreviated creates a supply problem and a QA problem at once: the removed part goes to the depot, passes no-fault-found, and returns to the shelf, while the symptom recurs at the next live-fire because the root cause was never identified. The weapons readiness brief now carries a trending fault the weapons officer is asking about, the supply officer is asking about the NFF return, and the section's name is on the recurring discrepancy. The GM2 whose section generates NFF returns and recurring faults is the one the LCPO has a different conversation with.
  • Letting AA&E access lists or custody turnovers drift because 'everyone knows everyone.'
    The access list is a security control, not a courtesy roster. A stale list or a sloppy turnover is the discrepancy the AA&E assessment finds first, and on a deployed ship where the section composition changes, the unauthorized name on the access list or the unreconciled turnover is the finding that puts the section's accountability posture — and the GM2's name — in front of the CO. Familiarity is exactly the condition under which accountability discipline quietly decays; the GM2's job is to keep it rigorous when nobody thinks it needs to be.
  • Cutting corners on explosives handling during an onload or offload because the schedule is tight.
    Live ordnance does not negotiate with the timeline. The compressed handling step, the skipped compatibility check, or the shortcut in the safety chain is the explosives-safety finding the assessment finds under your section's name — and the real-world consequence of getting it wrong is not a writeup, it is a casualty in the highest-consequence evolution the ship runs. The GM2 who lets the schedule compress the handling procedure is the one whose section is one bad day from an event the entire explosives-safety program exists to prevent.
  • Going around the LCPO to the Weapons Officer on a section issue.
    The weapons leadership chain runs through the chief; the command master chief hears about the bypass the same watch rotation, the goat locker discusses it, and the weapons officer who received it notes it. The GM2's Chief packet — which the LCPO is building or will be — reflects whether the GM2 understands how the chain is supposed to work. One documented bypass tells the goat locker what it needs to know about whether this GM2 is ready to be a Chief.

Career Decisions at This Rank

  • GM1 advancement cycle — FMS-building strategy and whether the section record supports an EP recommendation
    The GM1 slate is smaller than the GM2 slate, and the competitive pool includes every GM2 who has been building the FMS components across the tenure. The exam is the most controllable variable — a documented daily study log across months is an advantage the last-month crammer cannot close. The eEVAL is the second: the section QA rework rate, the AA&E accountability history, the GM3 PQS production, the small-arms program record, the warfare device, the NEC status, and the monthly counseling record all feed the eEVAL the LCPO writes. The GM2 who has been having the monthly counseling about ranking is never surprised by the outcome — and if the ranking is not EP-competitive, the GM2 who knows that six months before the board opens has six months to change it.
  • Advanced or second NEC — deepen the current weapons track or broaden to a complementary system
    The NEC decision at GM2 is more strategic than at GM3 because the billet market for GM1 and GMC is defined by NEC-coded positions. An advanced NEC in the same track — deeper gun-mount, launching-system, or CIWS maintenance — improves the billet match at the senior end of the sea-tour cycle and builds toward the NAVSEA program-office and Type Commander staff billets that flow from weapons modernization. A second NEC in a complementary system — gun-mount combined with launching system, or small-arms and armory expertise combined with a maintenance NEC — broadens the billet access and builds the multi-system profile defense contractors and federal armorer programs value. Pull the current source-rating NAVADMIN and read the actual billet demand for each NEC rather than the mess-deck impression of which pipeline has the best reputation.
  • Chief Petty Officer board preparation — start now or wait until GM1
    Start now. The Chief board evaluates the entire record across the GM2 and GM1 tenure, not just the GM1 eEVAL — and in the GM rate, an unbroken AA&E accountability history is a load-bearing part of that record, because the board will not advance a weapons leader with a custody gap. The components — eEVAL profile, warfare device, NEC pipeline, awards, the small-arms and accountability record, community involvement — are year-round accumulation, not a semester before submission. The GM2 who starts the Chief-packet conversation at GM2 is building the record consciously; the one who starts late may find a two-year gap in community involvement or an undone qualification needs a patch the timeline cannot absorb. The LCPO who hears 'I want to be a Chief' from a GM2 who has demonstrated Chief-level work and a clean accountability history for two years has a different packet to write than the LCPO who hears it from a GM2 who has not.

How the Seat Varies by Unit Type

  • DDG-51 Arleigh Burke / CG-47 Ticonderoga (Mk 45 gun, Mk 41 VLS, CIWS)
    On a destroyer or cruiser at GM2 the full weight of the weapons-section leadership lands. The deployment cycle is real — months at sea with a long workup before the ship leaves — and the GM2 runs the section through workup (where every system is tested against fleet readiness standards and the ammunition onloads are frequent), deployment (where maintenance and ordnance tempo run at maximum), and the post-deployment maintenance period (where deferred work and custody reconciliation come due). The GM2 who built strong documentation, calibration, and AA&E discipline during workup holds it through deployment; the one cutting corners during workup finds the deployment tempo exposes every gap — and on weapons gear and custody, the gap that gets exposed at sea is the one with real consequence.
  • LCS (Littoral Combat Ship — smaller crew, mission-dependent weapons)
    At GM2 on an LCS the smaller crew means broader individual accountability and a mission-package-dependent weapons suite rather than the standardized DDG fit. The GM2 runs the section with fewer bodies and takes on maintenance and custody responsibility that would be distributed across more technicians on a combatant. It is excellent leadership development — the GM2 owns more of the program directly — but the deep gun-mount and VLS depth the NEC market weighs most is thinner. The GM2 planning a defense-contractor weapons-support path needs a sea-tour record that shows deep system maintenance, which an LCS tour may need supplemented with a deliberate C-school pipeline.
  • Amphibious ship (LHA/LHD/LPD — large small-arms and ordnance program)
    On a big-deck amphib or LPD at GM2 the small-arms, armory, and ordnance program is often the section's center of gravity, given the embarked Marines and the volume of weapons and ammunition aboard. The GM2 runs a high-tempo small-arms qualification program and a large AA&E custody load, building deep accountability and instructor credibility and the program-management depth the GM1 and GMC billets need. The tradeoff is less hands-on time on the fire-control and gun-mount systems a DDG GM2 lives in — so the GM2 aiming at a gun-mount or VLS maintenance NEC should be deliberate about getting that experience.
  • Small-boat / shore-based security unit
    At GM2 a small-boat or shore security assignment makes the small-arms, crew-served-weapons, and armory program the whole job, and the GM2 typically runs it as the senior weapons authority for a smaller organization. The AA&E custody and qualification load is intense and the accountability is personal and highly visible. It builds deep small-arms instructor and armory-management credibility and a profile that maps cleanly to security-force, anti-terrorism, and federal-armorer paths — but it builds little of the shipboard gun-mount, CIWS, and VLS maintenance experience the fleet-maintenance NEC market weighs, so weight the next C-school accordingly.
  • NAVSEA / Type Commander shore weapons billet or schoolhouse instructor
    A NAVSEA, Type Commander, or schoolhouse instructor billet at GM2 is a significant credential — staff billets expose the GM2 to fleet weapons-maintenance policy, AA&E program management, and readiness reporting above the ship level, and a schoolhouse tour teaching weapons systems requires the depth only fleet experience provides. The eEVAL reflects staff or instructional contribution rather than ship metrics. The tradeoff is hands-on fault-isolation hours — the peer who stayed on a DDG has a more competitive maintenance record at the GM1 cycle. Come back with a completed Navy COOL credential, an NWAE study program that used the stable shore schedule, and a policy or instructional network the sea-tour peer does not have, and the tradeoff closes.

What Good Looks Like at This Rank

The good GM2 is the technician the Weapons Officer calls when the gun mount writes up a fault on deck before a live-fire and the clock is running. He goes to the NAVSEA technical-manual fault-isolation section for that specific symptom, reads the procedure from the top, and follows the branching logic to a call he can document with supporting evidence — not a call based on what a similar symptom turned out to be last time. His corrective-action entry is specific enough that the QA inspector reconstructs the diagnosis without calling him. The discrepancy closes clean; the system is back up with a real fix or correctly reported down with a documented backup mode and a realistic restoration timeline the weapons officer can brief to the TAO. His AA&E custody reconciles to the serial number every turnover, his access list is current and controlled, and when a discrepancy surfaces on deployment he reports it the instant he finds it and has trained his GM3s to do the same — the report-it-now reflex is the section's culture because he built it. His small-arms qualification program runs to standard with zero safety incidents, the crew's currency picture is accurate on demand rather than a pre-inspection scramble, and the OPNAV 3591/1 records are audit-ready. His GM3s are visible to the LCPO for the right reasons: their PQS line items progress because he identified which were ready and scheduled the witnesses, and their documentation comes through his substantive pre-QA review into QA without a return. The section's rework and discrepancy rate has been below the command average for two consecutive quarters, and the LCPO named it at the last weapons-department brief without being asked. His NWAE study log is a dated record spanning months, available to show the LCPO at any counseling. He is not surprised by his eEVAL ranking because he asked the LCPO directly at the midpoint where he stood relative to his peer GM2s. His advanced or second NEC is awarded or in pipeline, a Navy COOL armorer or ordnance credential is complete, and the Surface Warfare device is on the blouse. The Chief packet conversation started three months ago when the GM2 brought it up, not when the LCPO did. And the thing that defines him underneath all of it: in a rate where one lost weapon erases everything, his accountability history is unbroken, and the goat locker knows it. That is the GM2 the LCPO builds the Chief recommendation around.

Preview — The Next Rank

GM1 (E-6) is the LPO. When you put on the chevrons of a First Class Petty Officer in the GM rate, the weapons work center is yours — not as a delegated area of responsibility, but as the seat the Weapons Officer and the LCPO hold you accountable for at the weekly weapons maintenance management board. The GM2 was the senior technician the GM3 called for complex fault isolation; the GM1 is the senior technical voice the Weapons Officer calls before calling the chief, and the accountable authority for the ship's small-arms and ordnance inventory — which means a discrepancy is your name at the captain's mast even when another sailor signed the line. The eEVALs you write as GM1 for GM2s and GM3s pick the next advancement slates, and the GM1 whose eEVAL writing is honest and specific is the one the LCPO trusts to run the work center without daily check-ins. The Chief board becomes a concrete timeline, not a distant aspiration. The GM1 who arrives at the selection board with a record that reads itself — an EP-or-MP-consistent eEVAL profile, an awarded and current NEC, the Surface Warfare device, an unbroken AA&E accountability history, and a pipeline that produced NEC holders and credentialed sailors at GM2 and GM3 — is the GM1 the board promotes. The GM1 who arrives with gaps that require explanation is competing against sailors who did not have them. In the GM rate the board reads the accountability history first, because the rate is one lost weapon away from a career-ending event, and the board will not advance a weapons leader it cannot trust with the armory. What you cannot fully see from GM2 is how much the GM1 job is about the weapons readiness narrative rather than individual fault isolation. The GM2 runs a fault; the GM1 runs the section's readiness metrics, the AA&E accountability posture, the magazine and explosives-safety program, and the weapons maintenance management board brief — the section's role in the ship's overall combat readiness. The transition from doing the work to owning the section's outcome is the real change between GM2 and GM1, and the GM2 who already runs his section like an LPO, with an unbroken custody history and a rework rate below the command average without the LCPO tracking the milestones, is the GM2 the chief is watching for that promotion.
FAQ

GM E5 — Frequently Asked Questions

Q01What does a E5 GM (Gunner's Mate) actually do?
You run a section of the ship's weapons maintenance — the gun-mount and CIWS work center, the armory and small-arms program, the magazine and ammunition handling section, or the missile/launching system support — and you are the senior technician who either owns the fault diagnosis or reviews the GM3's work before it goes to QA.
Q02What's the most important thing to know as a E5 GM?
GM2: you are the working senior GM — the GM3s call you LPO whether the watchbill says so or not, and your initials on their maintenance and custody documentation are the standard the section is graded against.
Q03What does a typical day look like for a E5 GM?
Time-blocked day at the E5 GM rank tier: 0530 Wake up. Check the ship's maintenance management system and the overnight armory and magazine watch turnover for weapons write-ups, a magazine condition, or a custody note needing the GM2's attention — the items the weapons chief or the GMS may ask about at quarters, 0600 PT formation. The GM2 sets the section's PT standard by showing up and finishing strong, not by fading at the back. Weapons-department PT on the pier or flight deck is a department-visible event, 0700 Post-PT hygiene, chow, utilities on.…
Q04What mistakes get E5 GM soldiers fired or relieved?
A lost weapon or an AA&E accountability failure in your section — including one you allowed by letting a GM3 carry the custody program unsupervised, or by rubber-stamping a reconciliation you did not verify. At GM2 you are the custodian of record; the discrepancy is your name at the captain's mast even when another sailor signed the line. One lost weapon erases every clean rework rate, every qualified GM3, every readiness number on the record.…
Q05What career decisions matter most at the E5 GM rank tier?
GM1 advancement cycle — FMS-building strategy and whether the section record supports an EP recommendation — The GM1 slate is smaller than the GM2 slate, and the competitive pool includes every GM2 who has been building the FMS components across the tenure. The exam is the most controllable variable — a documented daily study log across months is an advantage the last-month crammer cannot close. The eEVAL is the second: the section QA rework rate, the AA&E accountability history, the GM3 PQS production, the small-arms program record, the warfare device, the NEC status,…
Q06What's next after E5 for a GM (Gunner's Mate) in the Navy?
GM1 (E-6) is the LPO.
Q07What manuals and regulations does a E5 GM need to know cold?
OPNAVINST 5530.13 series — Navy AA&E physical security; at GM2 you own the custody program, including the access-list and reconciliation provisions you enforce on your GM3s.; NAVSEA OP 5 / NAVSEA OP 4 and OPNAVINST 8020.14B — Navy Explosives Safety Management Program; the explosives-safety governance you are accountable to at the section level, not just the watch level.; OPNAVINST 3591.1 series — Small Arms Training and Qualification; you manage the program now, not just qualify on it.

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