Machine Gunner

You are the A-gunner. The gun team runs on your back, your barrel bag, and your ability to hump three hundred rounds of 7.62 link without dropping behind the squad — every Marine is a rifleman first, and you are the one who also feeds the gun.

You step off the 7-ton at your weapons platoon, your sea bag still smelling like MCRD, and the gun team leader hands you the assistant gunner slot on an M240 — spare barrel, T&E, tripod components, the rest of the link the gunner is not carrying, and the ammo bearer working under you who carries more. Most of your week is weapons cleaning on the M240 / M2 / Mk19, ranges, MCMAP, humps with the gun and tripod on your pack, the company gunny's police call, and the working parties the 1stSgt needs filled — armory guard, range support, ammo detail, motor-T washrack on the JLTVs and MRZRs the section mounts the guns to. Field ops are where the actual job lives: you dig the gun in to the team leader's range card, you sleep cold at Pendleton or Lejeune or up at MWTC Bridgeport with the gun across your chest, you eat MREs, and you run platoon attacks where the gun support-by-fires the rifle squads until the team leader stops correcting your sectors of fire, T&E settings, and beaten zone.

• 01Zero and qualify the M27 IAR or M4 to the Annual Rifle Training (ART) standard — Expert is the floor, because the gun is your job but the rifle is still your weapon.
• 02Function-check, load, reduce stoppages, and clear the M240B/G, M2A1/M2HB, and Mk19 — headspace and timing on the M2 in the dark, barrel change on the M240 in under fifteen seconds.
• 03Hump the gun: M240 (~27 lb) plus tripod (~20 lb) plus the spare barrel, T&E, and a working load of 7.62 link without falling out of the platoon hump.
• 04Build a gun position the team leader will sign for — primary, alternate, supplementary; sectors of fire; range card; T&E tracked traverse and elevation against the principal direction of fire.
• 05Run a TCCC casualty assessment — MARCH-PAWS — and apply a CAT tourniquet under fire without watching your hands, because the gun does not stop when somebody on the team goes down.
• 06Maintain your war belt, pack, and gun bag so they survive a 20-mile hump — dummy-cord what you cannot lose, waterproof the spare barrel, ditch the gucci nice-to-haves before the team leader does it for you.

• —MCDP 1 — Warfighting (every Marine reads it; you will be quizzed on the ideas, not the page numbers).
• —MCDP 1-3 — Tactics.
• —NAVMC 3500.44 — Infantry Training and Readiness Manual (the source of every 0331 individual and collective task you are evaluated against).
• —The current MCRP 3-15-series machine gun and heavy weapons employment manual (your gunner and team leader will quote it cold).
• —MCRP 3-10A.3 — Marine Rifle Squad and MCRP 3-10A.4 — Marine Rifle Platoon (you support the squads they describe).
• —MCO 6100.13 — Marine Corps Physical Fitness, Body Composition, and Military Appearance (your PFT/CFT lives here, and the gun rides the difference).

• —1st-Class PFT and CFT under MCO 6100.13 — anything below 1st-Class and the gun goes to a Marine who can hump it.
• —Annual Rifle Qualification: Expert badge on the blouse, with a slug score your team leader will know without looking.
• —Tan Belt out of MCRD, Gray Belt before you make LCpl, Green Belt before you sit a Cpl board — MCMAP under MCO 1500.54.
• —Earn the LCpl on the first look; second-look promotions are noted and remembered.
• —Pass the company-level Marine Corps Combat Readiness Evaluation (MCCRE) lanes your gun team runs — gun in action, FPF, displacement to alternate, casualty plan.

• —Treating gun cleaning as a formation event. The team leader who finds carbon in your gas system during a snap check remembers it for every working-party assignment after, and the gun goes to the Marine who treats it like a job.
• —Skipping the pre-combat check on T&E, tripod, spare barrel bag, and ammo can serviceability because "we did it yesterday." The first FPF call is the wrong time to learn the T&E mechanism is gummed up.
• —Buying high-speed gucci kit before you own the issued kit. The IBA / FLAK, plates, helmet, assault pack, and gun bag get graded; your aftermarket plate carrier does not.
• —Carrying the spare barrel uncovered or unsecured on a hump. A scarred or bent barrel is on the gunner who let his A-gunner show up like that, and the armorer does not replace it on the company training calendar.
• —Posting OPSEC-relevant content on social media — unit patch, deployment manifest, gun serial, geotag from a workup. The PAO and the S2 both run sweeps, and a gun team's photos are worse than a rifleman's.

The good boot machine gunner is invisible the right way: war belt squared, gun clean, T&E set, range card laminated, mouth shut, asking the questions during AAR instead of during the brief. By month nine the team leader is letting him gun an MCCRE lane cold; by month eighteen he is the LCpl the platoon sergeant pulls for the company Marine of the Quarter board, the next Corporals Course slot, and a look at the Machine Gun Leader Course when the section gets a seat.

You are an NCO. In this Corps the chevron means it the first time you pin it — Cpl is not "almost a Sgt," it is the first rank where the gun team runs on what you decide and where the rifle squad you are supporting trusts the rounds to land where you promised.

You own a gun team — three Marines counting yourself, sometimes four with a second ammo bearer, and an M240 or an M2 / Mk19 if your section is running heavies — and you are responsible for their training, their gear, their conduct on liberty, and their proficiency on every weapon and mount in the team. You run PCC/PCIs that actually inspect, you brief a five-paragraph order from a terrain model the boots can read, you build the range card that the platoon commander signs into the defense, and you write the proficiency and conduct marks that feed your Marines' composite scores. You are also still on the gun: gunner on the displacement, T&E man on the FPF, and the Cpl the section leader pulls for the working party that has to be done right the first time.

• 01Brief a gun team order in five paragraphs from a terrain model — SMEAC, sectors of fire, FPF orientation, displacement plan, casualty plan — no notes, no slides.
• 02Build and emplace a gun position that the section leader signs without changes — primary / alternate / supplementary, T&E set against the PDF, range card on a 5380 the squad leader can read in the dark.
• 03Run a PCC/PCI as a real inspection with consequences — sensitive items, ammo serviceability, barrel bag, T&E, spare parts, water, comm, casualty plan — not a head-nod ritual.
• 04Call for fire to the supporting-arms standard the platoon expects from any 0331, even though the 0861 owns it — every gun team needs another Marine who can talk to mortars and bring rounds onto the beaten zone.
• 05Operate the squad and section radios — PRC-117G, PRC-152, PRC-153 — and load CEOI without a printed cheat sheet, because the gun team works detached from the rifle squad as often as not.
• 06Run an M2A1 / M240 / Mk19 from a ground tripod, a JLTV mount, or an MRZR mount; headspace and timing on the M2 in the dark; barrel change on the M240 cold and hot.

• —The current MCRP 3-15-series machine gun and heavy weapons employment manual (own it; this is the manual the section leader quotes back to you on FPF, grazing fire, and beaten zone).
• —MCRP 3-10A.3 — Marine Rifle Squad (the squad you are supporting plans off this).
• —MCRP 3-10A.4 — Marine Rifle Platoon.
• —MCWP 3-01 — Offensive and Defensive Tactics for MAGTFs.
• —NAVMC 3500.44 — Infantry T&R (chapter on Cpl / Sgt 0331 collective tasks).
• —MCO 1610.7 — Performance Evaluation System (you sign proficiency / conduct marks now; the FitRep is coming).

• —Green Belt MCMAP minimum; Brown Belt is the bar you should be chasing before Sergeants Course.
• —Corporals Course graduate — required and gated; do not let the slot drop.
• —1st-Class PFT and CFT; your Marines do not respect a gun team leader who falls out of a hump under his own gun.
• —Composite score tracked monthly in TFRS — pull the current cutting score for 0331 to Sgt before you ask your section leader where you stand.
• —Machine Gun Leader Course graduate (or the slot identified) — the section leader is watching for it; the GySgt is asking about it.

• —Coasting on the Cpl chevron. The composite score does not coast; the Sergeants Course slot does not coast; the Machine Gun Leader Course slot does not coast; and your Marines notice the day you stop training them.
• —Skipping the Corporals Course packet because the slot is "probably next quarter." Slots evaporate; cutting scores do not move for you.
• —Building a range card from memory instead of the ground. The platoon commander will walk that sector and find the dead space you missed, and your squad will pay for it on the next MCCRE.
• —Mishandling a sensitive item — gun, T&E, barrel, NVG, radio — even once. The 1stSgt knows your name now, and not the way you want.
• —Posting OPSEC-relevant photos from a workup, a MEU, or a Twentynine Palms ITX. The S2 runs the sweep; your platoon pays the price for what you put online.

The good Cpl gun team leader is the Marine the section leader puts on the most important slot in the section without thinking — gunner on the FPF, T&E man on the displacement, terminal guidance for the rifle squad's support-by-fire. His boots are squared away because he counsels them honestly, not because he yells, and the platoon sergeant has already mentioned him to the company gunny for the next Sergeants board and the next Machine Gun Leader Course seat.

The gun squad is yours. Three gun teams, three Cpls, nine to twelve Marines, and the weapons platoon sergeant is mentoring you while the platoon commander leans on you to translate his intent into a fires plan the rifle squads can actually rehearse.

You run a machine gun squad in the weapons platoon — three M240 gun teams, sometimes attached to a rifle company in support, sometimes consolidated under the weapons platoon for FPF and defensive missions — and you are responsible for your Cpls' training, your Marines' equipment, their families, and their careers. You write FitReps on your three Cpls (yes, FitReps — in this Corps everyone E-1 to O-10 gets one annually under MCO 1610.7), you defend the gun squad's scheme of fires in the platoon back-brief, you sign for serialized guns, T&Es, tripods, and crew-served optics, and you translate the lieutenant's intent into a SMEAC the gun team leaders can rehearse without you in the room. You will be in the COC and the company office more than you remember being behind a gun — but the gun is still where the job lives, and the FPF you signed off on is your name in the platoon order.

• 01Develop and brief a gun squad scheme of fires that the platoon commander does not have to rewrite — gun positions, sectors of fire, FPF orientation, grazing/plunging fire plan, displacement and resupply.
• 02Run a gun squad live-fire as the squad leader — risk assessment (ORM), surface danger zones, MEDEVAC plan, ammo accountability — to the NAVMC 3500.44 collective standard.
• 03Write a clean Section A on FitReps for your three Cpls — observed behavior, action-result-impact, no inflation that the reporting senior cannot defend.
• 04Run a gun squad through MCCRE-graded lanes and recover from a thumping AAR without losing the squad on the way out.
• 05Mentor your three Cpls into Sergeants Course-ready and Machine Gun Leader Course-graduate candidates — gun team leadership, FitRep prep, composite score management.
• 06Walk a Marine through a financial problem (predatory lender, garnishment, command financial specialist referral) without making it the platoon sergeant's problem first.

• —The current MCRP 3-15-series machine gun and heavy weapons employment manual (own this manual; the platoon sergeant will quote it back to you).
• —MCRP 3-10A.3 — Marine Rifle Squad and MCRP 3-10A.4 — Marine Rifle Platoon (you support and integrate with these formations every field op).
• —MCWP 3-01 — Offensive and Defensive Tactics for the Marine Air-Ground Task Force.
• —NAVMC 3500.44 — Infantry T&R (Sgt / 0331 squad-level collective tasks; you are evaluated against this).
• —MCO 1610.7 — Performance Evaluation System (you write FitReps now, not just receive them).
• —MCO 1400.32 — Marine Corps Promotion Manual (composite scores, cutting scores, board eligibility for SSgt — pull the current MARADMIN).

• —Sergeants Course graduate — required and gated, no exceptions on the path to SSgt.
• —Machine Gun Section Leader Course graduate (or slated) — the next billet expects it before you walk into it.
• —Brown Belt MCMAP minimum; Black Belt is what the company gunny notes on the next FitRep.
• —1st-Class PFT and CFT; your gun squad average is watched and reported, and the gun does not forgive a 2nd-Class squad leader.
• —Squad MCCRE / pre-deployment evaluation rated at the unit standard or above — the platoon commander's next FitRep depends on it.

• —Verbal counseling only. If it is not in writing — page-11 entry or formal counseling — it did not happen and the company commander cannot defend you when it matters.
• —Letting a gun team smoke the platoon sergeant's sensitive-items count because you did not pre-inspect on Sunday — serialized gun, T&E, optic, and tripod all get inventoried, and one missing line item eats the company training calendar.
• —Doing the work yourself instead of teaching the Cpl to do it. The team will fail when you go to Sergeants Course, and you will be the reason.
• —Hiding a SAPR, EO, or self-harm-ideation issue from the chain. The Marine, the squad, and your career all need it in the system inside 24 hours.
• —Going around the platoon sergeant to the company gunny or 1stSgt. The chain runs through your platoon sergeant for a reason; the company will hear about it before you walk back to the squad.

The good Sgt gun squad leader is the squad leader the platoon sergeant gives the worst Marine in the company to, because that Marine comes back a Marine instead of a paperwork problem. His Cpls are FitRep-ready and Machine Gun Leader Course graduates, his gun squad scores the company's top MCCRE lane, and the platoon sergeant can take 30 days of leave knowing the FPF is set, the range cards are signed, and the platoon will not embarrass anyone on the calendar.

You are the senior NCO of a weapons platoon section — machine guns, sometimes paired with mortars and assaultmen under the same SSgt — or you are the platoon sergeant of a 30-45 Marine weapons platoon. The lieutenant signs. You execute. The company gunny is watching, and the SSgt-to-GySgt board is the career hurdle that defines your next decade.

You run the platoon's or section's enlisted side — training, evaluations, schools, promotions, MCMAP belt progression, discipline, equipment accountability, family readiness — for a population whose job is heavy weapons employment and whose gear list is longer than a rifle platoon's by a factor of three. You write three to four Sgt FitReps per cycle, you defend the platoon's or section's scheme of fires in the company back-brief, you build your lieutenant into a company commander, and you cover his blind spots on FPF integration, displacement timing, and ammo logistics without ever publicly correcting him. You operate at company and battalion level — the company gunny and the CO know your name, the S-3 schedules ranges around what your section can support, and the BSgtMaj is reading your FitRep against every other weapons platoon sergeant in the battalion. The lateral-move conversation to 0311 is also live at this rank — the senior infantry NCO career pool is shared, and the monitor will ask.

• 01Build a platoon or section training plan that survives contact with the S-3 long-range training calendar — T&R-aligned, range-bid (the gun ranges and ammo allocations are the constraint), locked in the calendar.
• 02Write three to four Sgt FitReps per cycle that the reporting senior can defend at the battalion review — clean Section A, defensible attributes.
• 03Run a platoon- or section-level collective live fire or MCCRE event to the NAVMC 3500.44 collective standard — risk assessment, surface danger zones, casualty rehearsal, ammo and barrel rotation plan.
• 04Mentor three Sgts into SSgt-board-ready candidates and Machine Gun Section Leader Course graduates without losing your edge on your own Career Course prep.
• 05Run a casualty notification or serious-incident response that the family and the company can live with — composed, scripted, and on the company's timeline.
• 06Act as company gunny in his absence — accountability formation, sick call, working parties, training calendar, all of it.

• —The current MCRP 3-15-series machine gun and heavy weapons employment manual (own this cover to cover; the section runs off it).
• —MCRP 3-10A.4 — Marine Rifle Platoon and the current MCRP 3-10A-series rifle company manual (the units your guns support and the SoP they fight to).
• —MCWP 3-01 — Offensive and Defensive Tactics for MAGTFs.
• —NAVMC 3500.44 — Infantry T&R (platoon-level 0331 collective standards you run training against).
• —MCO 1610.7 — Performance Evaluation System (FitRep policy you now write against, not just receive).
• —MCO 1400.32 — Marine Corps Promotion Manual (SSgt-to-GySgt board mechanics, FitRep relative-value impact; pull the current MARADMIN for the board cycle).

• —Career Course (resident or distance) completed; SNCO Academy slot for GySgt-level resident as soon as the board signals.
• —Black Belt MCMAP — at the SSgt level the platoon expects you to be one of the senior instructors in the company.
• —Platoon or section PFT/CFT pass rate at or above 95%; the BSgtMaj sees the unit health-of-the-force report and knows whose section is dragging.
• —Platoon or section MCCRE rating in the top tier of the company; ITX / SLTE evaluation at Twentynine Palms that the company commander can brief without an apology.
• —FitRep relative value above battalion average — the SSgt-to-GySgt board is FitRep-driven, and one weak cycle moves the timeline by years.

• —Writing a FitRep as a wish list instead of an evaluation. The reporting senior remembers the SSgt who inflated, and so does the next board.
• —Skipping the risk assessment on a live-fire. The CO will not stand behind you when a Marine takes a piece of brass in the eye or eats a hot barrel and the ORM worksheet is blank.
• —Letting your senior Sgt run wild because "he is your guy." That is favoritism on the next IG complaint and a relief on the next.
• —Allowing sensitive-items or armory accountability to slide during a movement day — guns, T&Es, optics, tripods, ammo containers all sign by serial number, and one missing line eats the company training calendar for a week.
• —Hiding platoon problems from the company gunny to look good. He will find out — usually from the lieutenant, in the worst possible meeting.

The good SSgt platoon sergeant or weapons section leader runs a section that performs identically whether he is at MEDEVAC, in the COC, or on a UDP rotation. His three Sgts are SSgt-board ready and Machine Gun Section Leader Course graduates. His Marines re-enlist for the right reasons and the school slots they wanted, and the company commander is willing to lose him to B Billet — recruiter, drill instructor, MSG — because the entire battalion knows he comes back as the GySgt the Corps needs.

You are the company gunny — or the weapons company operations chief, or the senior platoon sergeant of the toughest section in the battalion. Whatever the billet, you are the noncommissioned officer the entire weapons company runs through, and the 1stSgt is the only Marine in the building above you. At this rank the lateral move from 0331 to 0311, or the conversion to 0369 Infantry Unit Leader, is sitting on the monitor's desk and on yours.

You run the company's training and tasking calendar in concert with the 1stSgt and the company commander — for a weapons company that owns the battalion's M240s, M2s, Mk19s, mortars, and assault weapons, or for a rifle company whose weapons platoon you have just walked into as its senior NCO. You manage 100+ Marines through your platoon sergeants, you advise the CO on every enlisted decision, and you set the standard in formation that the boots watch and the SNCOs follow. You write three to five SSgt FitReps per cycle, you sit on the company training board with the operations officer, you run the company through pre-deployment training (ITX at Twentynine Palms / MCAGCC, MCCRE, SLTE, MWTC at Bridgeport for the cold-weather rotation), and you start the conversation with the 1stSgt and the BSgtMaj about the MSgt-vs-1stSgt path — and the 0369 conversion — before the next board cycle.

• 01Build and defend a weapons company quarterly training schedule that the CO can brief at battalion BUB without surprises — T&R-aligned, range and ammo resourced honestly, with bench-warming events built in.
• 02Write three to five SSgt FitReps per cycle that the battalion FitRep board can defend — clean attribute rationale, defensible relative value.
• 03Run a company through an ITX rotation at Twentynine Palms (MCAGCC), a Bridgeport / Okinawa training package, or a UDP as the senior NCO on the manifest.
• 04Mentor three or four SSgts into Career Course graduates and GySgt-board-ready candidates; identify the one or two who should be steering toward 1stSgt vs. MSgt, and the one who should be converting to 0369.
• 05Brief the company commander honestly on enlisted morale, retention, family readiness, and discipline trends the CO cannot see from his desk.
• 06Run a Red Cross or casualty notification with the dignity it requires — the family sees your face first.

• —The current MCRP 3-10A-series rifle company manual (your operational manual now — guns plus mortars plus assaults plus the rifle squads you support).
• —The current MCRP 3-15-series machine gun and heavy weapons employment manual (you teach the next generation off this, not consume it).
• —MCDP 1 — Warfighting; MCDP 1-3 — Tactics.
• —NAVMC 3500.44 — Infantry T&R (company-level collective tasks you build the training plan against).
• —MCO 1610.7 — Performance Evaluation System (FitRep mechanics you now teach to your SSgts).
• —MCO 1400.32 — Marine Corps Promotion Manual (GySgt-to-MSgt/1stSgt board mechanics, MOS roadmap including the 0369 conversion and 0331-to-0311 lateral; pull the current MARADMIN).

• —SNCO Academy Advanced Course (Career Course) graduate; SNCO Academy Senior Course slated when MSgt board approaches.
• —Black Belt Instructor (MCMAP) is the bar at this rank — Black Belt Instructor-Trainer (BBIT) if your career path supports it.
• —1st-Class PFT and CFT; the formation watches the company gunny's scores more than anyone's except the 1stSgt, and the gun company expects you to carry weight.
• —Company MCCRE / ITX rating that the battalion can brief without apology; pre-deployment training delivered on the timeline the CO signed for.
• —FitRep profile that the senior reporting official can defend at MSgt / 1stSgt board — relative value, attributes, and rationale all aligned.

• —Letting one platoon sergeant or section leader drift because you trust him. That is the section the IG inspection lands on and the company gunny absorbs.
• —Confusing being tight with the CO with being aligned with the CO. The company needs you to push back honestly, in his office, with the door closed.
• —Carrying a personal feud with a peer GySgt into the company. The BSgtMaj notices, the FitRep board notices, and the slate writes itself.
• —Skipping the family readiness piece because "the spouses run that." You sign the unit health-of-the-force input for a reason.
• —Going around the 1stSgt to the BSgtMaj. You will be wrong on the facts and relieved on the spot — and the Corps does not forget that promotion.

The good GySgt is the SNCO the BSgtMaj is willing to send to the worst billet in the battalion — Weapons Company Gunny on a workup, master gunner billet at the schoolhouse, instructor at SOI — because the unit comes back better and the FitReps come back clean. His SSgts get GySgt, his sections hit the MCCRE standard, the FPF plan in the company defense is the one the BC briefs at regiment, and the BSgtMaj is already mentioning his name to the regimental SgtMaj before the next 1stSgt or MSgt slate goes up.

You are the standard-bearer for the formation. Marines know whether the unit is broken or fixed by watching how you stand at colors. The split between 1stSgt/SgtMaj (troop leadership) and MSgt/MGySgt (occupational SME — often the master gunner billet at division or MARSOC) is the defining career decision of your final decade, and by this point most of you have converted to 0369 anyway and are leading rifle and weapons companies interchangeably.

As 1stSgt you run the company — 130-180 Marines, the company office, the platoon sergeants, the training calendar, and the boundary between what the CO needs and what the company can actually deliver — for a rifle company, a weapons company, or an H&S company that owns the battalion's heavy weapons fleet. As MSgt you are the senior occupational SME — operations chief, regimental gunny, MOS roadmap owner for the 03XX occfield, or the master gunner billet at division or MARSOC shaping the next generation of GySgts. As SgtMaj you advise the battalion or regimental commander on every enlisted decision and you set the standard for hundreds to thousands of Marines by what you walk past in formation. As MGySgt you are the occupational pinnacle, the Marine the MMPB calls when the 0331 (or 0369) MOS roadmap needs rewriting and the master gunner program needs an honest assessment. You write fewer FitReps but they are the ones that pick the next 1stSgt and SgtMaj slates.

• 01Run a 1stSgt's call that produces actions, not anxiety — accountability, sick call, training, discipline, family readiness, finance — in 30 minutes flat.
• 02Build a company training and tasking calendar with the CO and the GySgt that survives the battalion BUB without losing the platoons or burning out the gun teams.
• 03Mentor four GySgts and the senior SSgts as the next 1stSgt / MSgt cohort, with honest reads on who is troop-leadership and who is master-gunner / SME track.
• 04Walk the line during a battalion MCCRE or ITX and identify the broken systems in the platoons before the evaluators do.
• 05Run a Red Cross / casualty notification or memorial service with the dignity it requires — you are the face the family and the formation will remember.
• 06Brief the BC and the BSgtMaj on enlisted morale, retention, climate, and the second-order effects of policy decisions they cannot see from the conference room.

• —MCDP 1 — Warfighting; MCDP 1-3 — Tactics (you teach these, not consume them).
• —MCO 1610.7 — Performance Evaluation System (you are the rater or reviewing officer on the FitReps that decide the next slate).
• —MCO 1400.32 — Marine Corps Promotion Manual (1stSgt / SgtMaj / MGySgt board mechanics; pull the current MARADMIN for the slate).
• —MCO 1900.16 / MCO P1900.16 — Marine Corps Retirement / Separation (you are the resource the unit comes to for transition questions).
• —MCO 5354.1 — SAPR Program; MCO 1000.9 — Equal Opportunity (you enforce both, the IG validates both).
• —The Sergeants Major Symposium reading list, the Commandant's Reading List, and the current Planning Guidance — you are expected to consume strategic doctrine and translate it down to LCpls.

• —SNCO Academy Senior Course graduate; Sergeants Major Course (USMC SgtMaj Academy at Marine Corps University, Camp Geiger NC) before competing for command SgtMaj slate.
• —Company UCMJ rate, retention rate, and SAPR/EO climate index in the top tier of the battalion — the BSgtMaj reports up against every peer 1stSgt.
• —Personal FitRep profile that the reporting senior can defend at HQMC — the bar at this rank is whether your rated GySgts get selected for 1stSgt and MSgt.
• —Zero senior-enlisted-level integrity incidents — financial, fraternization, OPSEC. One ends the career permanently at this rank and the Corps does not relitigate.
• —Post-service transition plan running 24-36 months out — VA disability claim filed pre-EAS, SkillBridge slot identified, no retirement walked into cold.

• —Going public with disagreement with the CO. You take the disagreement in his office with the door closed; you walk out aligned, every time.
• —Confusing seniority with leverage. The Corps keeps senior enlisted who serve the formation, not the ones who run their own program off the company commander's back.
• —Stopping personal PT because you are "too senior." Marines stop respecting the chevrons when the body stops carrying them, and the 1st-Class PFT is still the bar.
• —Letting a GySgt run a bad climate because he is your guy. The BSgtMaj finds out, the regimental SgtMaj finds out, and the next slate gets read off without your name on it.
• —Confusing the warm-up to retirement with the job. Until you walk out of the formation for the last time, the formation is your job — boots are still watching how you carry it.

The good 1stSgt / SgtMaj is the senior Marine every boot in the formation knows by face and reputation. He is the reason the re-enlistment line forms after a hard ITX rotation, and the reason the weapons company believes the FPF plan is actually rehearsable. The CO trusts him with the worst news at 0200; the Marines trust him to walk away from a fight he cannot win for them only when he absolutely cannot win it. The good MGySgt is the Marine the MMPB calls when the 03XX occfield roadmap needs rewriting or the master gunner program needs an honest assessment — and the GySgts in the regiment quote him without realizing they are doing it.