Field Artillery Cannoneer

You are the cannoneer. The section runs on your back, your arms, and your ability to ram a 95-pound projectile into the breech the same way, every time, under fire — every Marine is a rifleman first, and you are also the one who feeds the gun.

You step off the 7-ton at your artillery battery, your sea bag still smelling like MCRD, and the section chief drops you into a crew position on the M777A2 — ramming crew, brass-and-cartridge handler, or trail-leg operator — depending on what the battery needs and what the school at Fort Sill certified you to do. Most of your week is cannon maintenance, bore-clearing, primer-punch-out drills, powder-charge handling, ranges, humps out of Lejeune or Twentynine Palms, the battery gunny's police call, and the working parties that keep an artillery battery breathing — ammo point detail, motor-T washrack on the 7-tons and LVSRs, OP guard. Field operations are where the actual job lives: you occupy gun line positions, dig spades in to stop the cannon from rolling back through you, manhandle 95-pound projectiles in the dark, and fire missions until the gun line chief stops correcting your ram stroke, your cut-powder consistency, and your time from "FIRE" to round down the tube.

• 01Zero and qualify the M27 IAR or M4 to the Annual Rifle Training (ART) standard — Expert is the floor, because the cannon is your job but the rifle is still your weapon and the 0811 defense of a gun line position depends on it.
• 02Function-check, ream, and clean the M777A2 to TM 9-1025-215-10 standard — breech mechanism, barrel bore, recoil mechanism — and identify the ten most common malfunction indicators before the section chief finds them first.
• 03Ram, fuse, and set a 155mm projectile to the firing data card without coaching — powder-charge cut and assembly, primer insert, and call "READY" only when the round is actually seated and the breech is closed.
• 04Read and apply a firing data card — elevation, deflection, charge, fuze-setting — and execute the fire command sequence from "FIRE" to downrange report without the section chief repeating himself.
• 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 crew goes down.
• 06Maintain your war belt and pack for a gun-line occupation — dummy-cord the tools you cannot lose, keep the ram staff out of the mud, and ditch the gucci nice-to-haves before the section chief 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 3500.55 — Field Artillery Training and Readiness Manual (the source of every 0811 individual and collective task you are evaluated against).
• —TM 9-1025-215-10 — Operator's Manual for the M777/M777A2 155mm Howitzer (the operator's bible; your section chief knows every chapter).
• —MCWP 3-16.1 / FM 3-09 — Artillery Cannon Gunnery (the joint doctrinal reference for cannon gunnery procedures your FDC and section chief plan off).
• —MCO 6100.13 — Marine Corps Physical Fitness, Body Composition, and Military Appearance (your PFT/CFT lives here; the cannon does not care about your score but your ability to hump and lift under load does).

• —1st-Class PFT and CFT under MCO 6100.13 — crewing a 155mm howitzer requires sustained heavy-lifting and the gun line does not slow down for a 2nd-Class cannoneer.
• —Annual Rifle Qualification: Expert badge on the blouse, with a slug score your section chief 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.
• —Gun crew qualification signed by section chief before your first evaluation cycle — unqualified cannoneers on the gun line are a safety violation, not a training shortfall.
• —Earn the LCpl on the first look; second-look promotions are noted and remembered in an artillery battery that runs on time-on-target.

• —Ramming a round you did not verify is properly fused and oriented. The round that goes down the tube backwards or with an unsafed fuze ends the mission and the crew — the "ready" call is a safety certification, not a formality.
• —Cutting powder charges by feel instead of by count and weight. Inconsistent propellant charges move rounds off-mission and onto friendlies; the FDC cannot compensate for a cannoneer who eyeballs the powder.
• —Treating cannon bore-clearing as a paperwork event. The section chief who finds a live primer in the breech during a snap check will make the experience educational in ways that do not appear on a training form.
• —Going to medical only when something is already broken. The back you hurt rammming rounds at Twentynine Palms is the claim the VA fights you about in fifteen years — document it now.
• —Posting OPSEC-relevant content on social media — gun line location, ammunition type, fire mission volume, geotag. The PAO and the S2 both run sweeps, and artillery data is a high-value targeting indicator.

The good boot cannoneer is invisible the right way: weapon maintained, ram stroke clean and fast, powder charges cut consistently, firing data card executed without a second prompt, mouth shut during the mission, questions asked at AAR. By month nine the section chief is letting him crew gun one on an MCCRE evaluation cold; by month eighteen he is the LCpl the battery gunny pulls for the company Marine of the Quarter board and the next Corporals Course slot.

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 cannon section watches what you decide and where the rounds landing downrange are a direct product of whether you ran the gun correctly.

You own a crew position as the senior cannoneer or the section chief's right hand on an M777A2 or, in reserve components, an M198 — four to eight Marines depending on the section's manning, and you are responsible for their training, their gear, their conduct on liberty, and their qualification status on every position on the gun. You run PCC/PCIs that actually inspect, you brief the crew on the firing data card before the section chief has to repeat it, you verify fuze settings and charge cuts before the round goes down the tube, and you write the proficiency and conduct marks that feed your Marines' composite scores. You are also still on the gun: ramming crew lead on the MCCRE, section chief stand-in when the SSgt takes the FDC brief, and the Cpl the battery gunny pulls for the working party that needs a sergeant's eye without a sergeant's time.

• 01Brief the gun crew on a firing data card in the five-paragraph sequence — mission, target, data, charge, fuze — from a terrain model or a whiteboard the crew can read in the dark without a flashlight.
• 02Run a PCC/PCI as a real inspection with consequences — M777A2 system checks, fuze lot compliance, powder charge lot segregation, aiming circle setup, spade condition — not a head-nod ritual.
• 03Set up and collimate the M777A2 aiming circle to TM 9-1025-215-10 standards without the section chief rechecking your numbers before a registration mission.
• 04Execute section chief duties during a fire mission when the SSgt is in the FDC — data verification, ram confirmation, muzzle velocity correction tracking, safe zone enforcement on the gun line.
• 05Operate battery-net radios — PRC-117G, PRC-152 — and pass a standard artillery call-for-fire message format without reading the CEOI out loud.
• 06Walk a casualty through a 9-line MEDEVAC and conduct a TCCC handoff the corpsman actually wants to receive, because the gun section may be the first treatment tier on a dispersed gun line.

• —TM 9-1025-215-10 — M777/M777A2 Operator's Manual (own this; the section chief quotes it back to you on every maintenance discrepancy).
• —MCWP 3-16.1 / FM 3-09 — Artillery Cannon Gunnery (the gunnery procedures reference you run against during registration and every check-fire).
• —NAVMC 3500.55 — Field Artillery T&R (chapter on Cpl / section-chief-candidate collective tasks).
• —MCRP 3-10A.3 — Marine Rifle Squad and MCRP 3-10A.4 — Marine Rifle Platoon (you support these formations; you need to understand the scheme of maneuver you are enabling).
• —MCWP 3-1.6 / MCRP 3-10A.7 — Fire Support (the integration doctrine the FO and FDC use; section chiefs who understand it get called to the FDC brief).
• —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 section chief candidate who falls out of the gun line because he cannot lift and hump through a 12-hour fire mission.
• —Composite score tracked monthly in TFRS — pull the current cutting score for 0811 to Sgt before you ask your battery gunny where you stand.
• —Section-chief qualification signed by the battery commander or his designee — the path to Sgt runs through it and the monitor notices if you are still a crew-position cannoneer when the board meets.

• —Coasting on the Cpl chevron. The composite score does not coast; the Sergeants Course slot does not coast; and your crew notices the day you stop drilling them on the firing data sequence.
• —Skipping the Corporals Course packet because the slot is "probably next quarter." Slots evaporate; cutting scores do not move for you, and artillery Cpls who wait get passed by those who do not.
• —Verifying a fuze setting verbally without pulling the round back out for a visual check. An incorrectly set fuze is a fire-mission failure or a premature detonation — the crew brief is not a substitute for hands-on confirmation.
• —Mishandling a sensitive item — aiming circle, gun serial, 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 Artillery Table VIII. The S2 runs the sweep; your section pays the price for what you put online.

The good Cpl section chief candidate is the Marine the battery gunny puts in the section chief seat on the hardest MCCRE lane without hesitation — data verified, charges cut clean, round down the tube in time-on-target, crew position filled when one goes down. His cannoneers are squared away because he counsels them honestly and drills them constantly, and the platoon sergeant has already mentioned him to the battery gunny for the next Sergeant board and the next section chief slot.

The gun section is yours. Six to eight Marines, one M777A2, and the Fire Direction Center is sending fire missions on your answer. The battery gunny is watching, the FDC chief is watching, and the platoon commander is leaning on you to translate firing data into steel on target before the maneuver element runs out of time.

You run a howitzer section — six to eight Marines and yourself on an M777A2 — and you are responsible for their training, their equipment, their families, and their careers. You write FitReps on your Cpls (yes, FitReps — in this Corps everyone E-1 to O-10 gets one annually under MCO 1610.7), you brief the section on firing data before the FDC sends the mission, you run the section through occupation, displacement, and registration without the battery gunny having to stand over you, and you are the Marine the FDC calls when a mission is time-sensitive and the fire direction chief needs a section chief who does not need a second prompt. You will be in the FDC more than you expect — fire mission critiques, registration review, ammunition accountability — but the gun line is still where the job lives, and the target you engage is on your section chief record.

• 01Occupy, register, and displace an M777A2 gun line position to the NAVMC 3500.55 collective standard — site selection, aiming circle registration, charge segregation, ammunition disposition — faster than the FDC changes its mind.
• 02Run a section through a fire mission with a check-fire, a misfire procedure, and a displacement under the TM 9-1025-215-10 standard without coaching from the battery gunny.
• 03Write a clean Section A on FitReps for your Cpls — observed behavior, action-result-impact, no inflation that the reporting senior cannot defend.
• 04Conduct section-level ammunition accountability and lot segregation for the FDC — propellant lot, projectile lot, fuze lot, primer lot — because a lot-mixing mistake creates a range error that goes in your section chief record.
• 05Mentor your Cpls into section-chief-candidate-qualified and Sergeants Course-ready Marines — cannon gunnery fundamentals, FitRep prep, composite score management.
• 06Walk a Marine through a financial problem (predatory lender, BAH allotment issue, command financial specialist referral) without making it the battery gunny's problem first.

• —TM 9-1025-215-10 — M777/M777A2 Operator's Manual (own this manual; the battery gunny will quote it back to you on every maintenance report).
• —MCWP 3-16.1 / FM 3-09 — Artillery Cannon Gunnery (the gunnery reference you run the section against; section chiefs who own the gunnery manual get called to the FDC brief).
• —NAVMC 3500.55 — Field Artillery T&R (Sgt / section-chief collective tasks; you are evaluated against this).
• —MCWP 3-1.6 / MCRP 3-10A.7 — Fire Support (the integration doctrine you operate within; section chiefs who understand fire support planning are the ones the FDC trusts with complex missions).
• —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.
• —Brown Belt MCMAP minimum; Black Belt is what the battery gunny notes on the next FitRep.
• —1st-Class PFT and CFT; your section average is watched and reported, and a section chief who cannot hump his section into position loses the crew before the mission fires.
• —Section MCCRE / pre-deployment evaluation rated at the unit standard or above — the battery commander's next FitRep depends on it, and yours depends on his.
• —Composite score tracked monthly; pull the current MARADMIN / TFRS cutting score for 0811 to SSgt before you ask the battery gunny where you stand.

• —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 your senior cannoneer run the section through a misfire procedure without you on the gun. One misfire handled wrong is an explosion and a Class-A mishap; the section chief's name is on every procedure in the TM.
• —Doing the gunnery work yourself instead of teaching the Cpl to do it. The section will fail the MCCRE 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 section, and your career all need it in the system inside 24 hours.
• —Going around the battery gunny to the 1stSgt or the battery commander. The chain runs through your battery gunny for a reason; the battery will hear about it before you walk back to the gun line.

The good Sgt section chief is the section chief the battery gunny puts on the hardest mission in the fire plan — time-on-target with a sub-30-second suspension window — without second-guessing the assignment. His Cpls are FitRep-ready and section-chief-candidate qualified, his section scores the battery's top MCCRE lane, and the battery gunny can take 30 days of leave knowing the section will not drop a round short or put a misfire in the FDC's log.

You are the senior NCO of a gun platoon — two to four howitzer sections and the FDC element feeding them — or you are the gun line chief for an entire battery. The battery commander signs. You execute. The battery gunny is watching, and the SSgt-to-GySgt board is the career hurdle that defines your next decade.

You run the platoon's or gun line's enlisted side — training, evaluations, schools, promotions, MCMAP belt progression, discipline, ammunition and equipment accountability, family readiness — for a population whose job is moving heavy steel precisely and whose gear accountability extends from howitzer serial numbers to powder-lot segregation records. You write three to four Sgt FitReps per cycle, you defend the platoon's or battery's fires plan in the battalion back-brief, you build your lieutenant into a battery commander, and you cover his blind spots on registration drift, FDC data cross-checks, and ammo resupply logistics without ever publicly correcting him. You operate at battery and battalion level — the battery gunny and the CO know your name, the S-3 / fires officer schedules training around what your sections can support, and the BSgtMaj is reading your FitRep against every other platoon sergeant in the artillery regiment.

• 01Build a platoon or battery training plan that survives contact with the regimental S-3 long-range training calendar — T&R-aligned, ammunition-allocation-bid, howitzer-maintenance-cycle-aware, 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, no inflation.
• 03Run a platoon- or battery-level collective live fire or MCCRE event to the NAVMC 3500.55 collective standard — risk assessment, surface danger zones, MEDEVAC plan, ammunition accountability from pre-mission to post-mission reconciliation.
• 04Mentor three Sgts into SSgt-board-ready candidates without losing your edge on your own Career Course prep.
• 05Run a casualty notification or serious-incident response that the family and the battery commander can live with — composed, scripted, and on the battery's timeline.
• 06Act as battery gunny in his absence — accountability formation, sick call, working parties, training calendar, all of it.

• —TM 9-1025-215-10 — M777/M777A2 Operator's Manual (own this cover to cover; you run the maintenance program now).
• —MCWP 3-16.1 / FM 3-09 — Artillery Cannon Gunnery (the gunnery reference you are training section chiefs against; SSgts who do not own it cannot mentor Sgts who need to).
• —NAVMC 3500.55 — Field Artillery T&R (platoon-level collective standards you run training against).
• —MCWP 3-1.6 / MCRP 3-10A.7 — Fire Support (integration doctrine; at SSgt you start shaping the fires plan, not just executing it).
• —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 battery.
• —Platoon or gun line PFT/CFT pass rate at or above 95%; the BSgtMaj sees the unit health-of-the-force report and knows whose platoon is dragging.
• —Platoon or battery MCCRE / FIREX rating in the top tier of the regiment; live-fire evaluation at Twentynine Palms or MCAGCC that the battalion 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 GySgt board.
• —Skipping the live-fire risk assessment. The battery commander will not stand behind you when a round lands short and the ORM worksheet is blank.
• —Letting your senior section chief run the gun line unchecked because "he has it." That is the section the mishap investigation opens on and the SSgt absorbs.
• —Allowing ammunition lot segregation or howitzer serial-number accountability to slide during a displacement. One lot-segregation error produces a range safety violation and a shut-down range; one missing howitzer serial number eats the regiment's training week.
• —Hiding platoon problems from the battery gunny to look good. He will find out — usually from the FDC chief, in the worst possible AAR.

The good SSgt gun line chief runs a platoon that fires accurately whether he is at the FDC, at MEDEVAC, or on a UDP rotation. His section chiefs are SSgt-board ready, his Sgts earn their section-chief qualifications on the first attempt, his Marines re-enlist for the right reasons and the school slots they wanted, and the battery commander is willing to lose him to B Billet because the entire battalion knows he comes back as the GySgt the regiment needs.

You are the battery gunny — or the battalion fire direction chief, or the senior NCO of a firing battery. Whatever the billet, you are the noncommissioned officer the entire battery runs through, and the 1stSgt is the only Marine in the building above you on the enlisted side.

You run the battery's training and tasking calendar in concert with the 1stSgt and the battery commander. You manage 100+ Marines through your section chiefs and platoon sergeants, you advise the CO on every enlisted decision, and you set the standard in formation that the boot cannoneers watch and the SNCOs follow. You write three to five SSgt FitReps per cycle, you sit on the battery training board with the operations officer, you run the battery through pre-deployment training (FIREX at Twentynine Palms / MCAGCC, MCCRE, Artillery Training and Readiness evaluations), and you start the conversation with the 1stSgt and the BSgtMaj about the MSgt-vs-1stSgt path before the next board cycle. As fire direction chief you are also shaping the battery's fire mission quality — registration drift management, computational backup procedures, and the FDC-to-gun-line communication standards that keep rounds on target and out of the maneuver corridor.

• 01Build and defend a battery quarterly training schedule that the CO can brief at battalion BUB without surprises — T&R-aligned, ammunition-allocation-bid-aware, howitzer-maintenance-cycle-aware, with bench 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 battery through a FIREX rotation at Twentynine Palms (MCAGCC), a 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 vs. fire direction chief billet.
• 05Brief the battery commander honestly on enlisted morale, retention, family readiness, and discipline trends the CO cannot see from the FDC.
• 06Run a Red Cross or casualty notification with the dignity it requires — the family sees your face first.

• —TM 9-1025-215-10 — M777/M777A2 Operator's Manual (you teach the next generation off this; the maintenance program runs on your word).
• —MCWP 3-16.1 / FM 3-09 — Artillery Cannon Gunnery (you now own the battery's gunnery standard; section chiefs run training off what you built).
• —NAVMC 3500.55 — Field Artillery T&R (battery-level collective tasks you build the training plan against).
• —MCWP 3-1.6 / MCRP 3-10A.7 — Fire Support (integration doctrine; at GySgt you sit in the fires coordination meeting, not just the gun line).
• —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; pull the current MARADMIN for the board cycle).

• —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 battery formation watches the gunny's scores more than anyone's except the 1stSgt, and an artillery battery that cannot hump cannot displace.
• —Battery MCCRE / FIREX rating that the regiment 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 section chief drift because you trust him. That is the section the mishap investigation opens on and the battery gunny absorbs.
• —Confusing being tight with the CO with being aligned with the CO. The battery needs you to push back honestly — in his office, about gunnery risk and ammunition shortfalls, with the door closed.
• —Carrying a personal feud with a peer GySgt into the battery. 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, and artillery deployments are long enough that the battery's family readiness posture shows up on retention.
• —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 battery gunny is the SNCO the BSgtMaj is willing to send to the worst billet in the regiment — Firing Battery Gunny on a workup, fire direction chief billet at the schoolhouse, instructor at the Field Artillery School at Fort Sill — because the unit comes back better and the FitReps come back clean. His SSgts get GySgt, his sections hit the MCCRE standard, the battery's rounds land on target, 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 battery is broken or fixed by watching how you stand at colors. The split between 1stSgt/SgtMaj (troop leadership) and MSgt/MGySgt (occupational SME — regimental fires chief, division FA staff, or schoolhouse master gunner billet) is the defining career decision of your final decade.

As 1stSgt you run the battery — 130-180 Marines, the battery office, the section chiefs and platoon sergeants, the training calendar, and the boundary between what the CO needs and what the battery can actually fire. As MSgt you are the senior occupational SME — regimental fires chief, battalion S-3 fires staff senior, division FA staff senior, or the master gunner billet at the Field Artillery School at Fort Sill shaping the next generation of section chiefs. As SgtMaj you advise the battalion or regimental commander on every enlisted decision and you set the standard for hundreds of Marines by what you walk past in formation and what you allow on the gun line. As MGySgt you are the occupational pinnacle of the field artillery occfield — the Marine the MMPB calls when the 0811 MOS roadmap needs rewriting or the gunnery evaluation standard 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 battery training and tasking calendar with the CO and the GySgt that survives the regimental BUB without losing the sections or blowing the ammunition allocation.
• 03Mentor four GySgts and the senior SSgts as the next 1stSgt / MSgt cohort, with honest reads on who is troop-leadership and who is fires-SME / master-gunner track.
• 04Walk the gun line during a battalion FIREX or MCCRE and identify the broken gunnery systems and the safety violations 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 regimental 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 battery 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 boot cannoneers.

• —SNCO Academy Senior Course graduate; Sergeants Major Course (USMC SgtMaj Academy at Marine Corps University, Camp Geiger NC) before competing for command SgtMaj slate.
• —Battery 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, safety-violation-cover-up. 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 — about ammunition shortfalls, unsafe range conditions, unrealistic timelines — 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 battery 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 even when you are carrying the entire battery on your back.
• —Letting a GySgt run a bad climate or a bad safety program 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 — boot cannoneers are still watching how you carry it, and they will tell the recruiter what they saw.

The good 1stSgt / SgtMaj is the senior Marine every boot cannoneer in the battery knows by face and reputation. He is the reason the re-enlistment line forms after a hard FIREX rotation at Twentynine Palms. 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 0811 occfield roadmap needs rewriting or the gunnery evaluation standard at the Field Artillery School needs an honest assessment — and the section chiefs across the regiment quote his section-occupation standards without realizing they are doing it.