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5939E7

Aviation Communication Systems Technician

E-7 (Sergeant First Class) · Marines

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

GySgt in the 5939 community is the MALS avionics/comms division chief rank — full communications maintenance program authority, COMSEC account custodian of record, and the senior NCO above a section of 15-30 Marines. The MSgt/1stSgt versus MGySgt fork is the defining career decision you will make at this rank: 1stSgt path is troop leadership; MGySgt path is NAVAIR program authority, NATTC schoolhouse, or wing-level comms avionics staff. Build the FitRep profile for one of those paths deliberately — the board does not reward ambiguity.

The Honest MOS Read
Gunnery Sergeant in the 5939 community is the communications avionics division chief rank. In a Marine Aviation Logistics Squadron, the GySgt runs the entire communications avionics maintenance program — not a section, the program. Every CDI-qualified Sgt and SSgt in the division operates within the training cadence, the COMSEC accountability cycle, and the quality assurance relationship that you built and maintain. The Maintenance Officer advises the squadron commanding officer on aviation readiness; you make the maintenance program run. The 1stSgt is your parallel on the administrative and personnel side; the Commanding Officer is above you both. The BSgtMaj of the MALS reads your FitRep against every other GySgt in the wing. The COMSEC custodian billet at GySgt is the most consequential administrative responsibility in the 5939 community at this rank tier. You are not the sub-custodian any longer — you are the custodian of record. Every crypto key, every fill device, every classified COMSEC item in the MALS communications section is inventoried and accounted for under your signature. The semi-annual audit submitted to the Communications Officer and the CoSec reflects your program's health with no intermediary. A finding at audit does not land on the sub-custodian; it lands on you, and the Communications Officer's written report goes to the Commanding Officer. The GySgt who runs the COMSEC account as a continuous-maintenance program — inventory current, destruction records complete, transfer documentation clean, Two-Person Integrity logs closed out within 24 hours of each evolution — is the GySgt whose account has never generated a finding in three years. That account history is visible to the BSgtMaj and it travels in your FitRep. The CDI program authority is the GySgt's technical signature. When the Quality Assurance Representative division pulls a CDI sign-off and challenges the write-up, it comes to you for resolution. The GySgt who built the CDI qualification documentation on each section chief — demonstrated error rate, systems-scope coverage, training events, shop officer endorsement — can defend every challenged sign-off with the paper trail. The GySgt who allowed CDI qualifications to accumulate without documentation cannot. The NAVINSGEN inspection does not distinguish between a CDI sign-off that was done correctly and a CDI sign-off that was done correctly but cannot be proven — both look the same to the inspector, and the GySgt's name is on the program. The FitRep program at GySgt is where your career's institutional legacy is built. You write three to five SSgt FitReps per cycle under MCO 1610.7. The Section A narrative on each SSgt — what you observed in what maintenance context, with what measurable outcome — is the material the Maintenance Officer or the squadron CO builds attribute marks against and the MALS CO reviews at the battalion FitRep board. A Section A that describes a specific COMSEC audit outcome, a specific CDI program intervention, or a specific maintenance review result with the SSgt as the proximate cause is the Section A the reporting senior endorses without revision. A Section A that reads 'exceptional Marine with unparalleled technical knowledge' is the Section A the reporting senior rewrites, and the GySgt whose Section As keep getting rewritten is not the avionics division chief the MSgt/1stSgt board selects. Mentoring three or four SSgts into GySgt-board-ready candidates is the GySgt's bench investment. Each SSgt is on a different trajectory — one building toward the 1stSgt troop-leadership path, one toward the NAVAIR/NATTC fires-SME path, one who is not sure yet and needs the honest read on which direction his record supports. The GySgt who identifies the trajectory gap early and steers that Marine toward the path his instincts actually support — and writes the next FitRep cycle to align — does the Marine Corps a service. The GySgt who lets every SSgt believe he is 1stSgt material and submits ambiguous FitReps that do not clearly develop either path produces SSgts who are competitive for neither board. The retention and family readiness program is the avionics division chief's signature on the MALS's institutional health. An aviation maintenance community has a demanding OPTEMPO — MEU PTP workups, 6-7 month MEU deployments on ARG shipping, MCAS Iwakuni or Beaufort UDP rotations, and the garrison surge cycles between deployments. The Marines who stay are the ones whose families are supported and whose career development is being managed deliberately. The GySgt who runs family readiness briefs before every major deployment, who knows the names of the spouses of his SSgts, and who routes financial and personal crises to the right MCCS, legal, and behavioral health resources before they become retention losses is the GySgt the wing's retention numbers reflect. The BSgtMaj reads the MALS's retention numbers against every peer avionics division in the wing. The MSgt versus 1stSgt path decision crystallizes at GySgt. The Marine Corps selects for these paths separately from the same competitive pool; FitReps that clearly demonstrate troop leadership competency — discipline management, retention outcomes, family readiness, PT culture, junior Marine development — feed the 1stSgt board. FitReps that demonstrate 5939 occupational technical expertise — COMSEC account health, CDI program rigor, NAVAIR program participation, schoolhouse billet performance — feed the MSgt/MGySgt board. The GySgt who has spent a career in avionics shops and has the technical instincts but not the desire to manage the administrative weight of a 150-Marine MALS company as 1stSgt should build toward the MSgt path deliberately and early, not hope the board reads versatility into an ambiguous record.
Career Arc
  • 01GySgt pin-on via centralized SNCO selection board — MALS communications avionics division chief or squadron avionics section GySgt billet assumption.
  • 02COMSEC custodian of record assumption — full key inventory, destruction records, semi-annual audit cycle, under MCO 5530.14.
  • 03First complete FitRep cycle as rater on three to five SSgt avionics section chiefs — Section A narrative, MALS CO FitRep board review.
  • 04SNCO Academy Advanced Course (Career Course) completed; Senior Course slated as MSgt/1stSgt board window approaches.
  • 05NAVINSGEN or MAL readiness evaluation as division chief — CDI program, COMSEC account, T&R completion, and maintenance records are the evaluator's read on you.
  • 06MSgt/1stSgt versus MGySgt path decision — documented in FitRep profile and billet requests through the Maintenance Officer and BSgtMaj.
  • 07MSgt/1stSgt centralized selection board — FitRep relative value, PME completion, billet type, and conduct are the board's read.
Common Screwups
  • ×Letting one SSgt section chief drift because you trust him. That is the section the NAVINSGEN CDI audit flags and the GySgt absorbs at the wing maintenance review debrief. The GySgt who stops walking the section he trusts most is the GySgt who gets the worst COMSEC finding at the worst inspection.
  • ×Confusing being tight with the Maintenance Officer with being aligned with the Maintenance Officer. She needs you to push back honestly — in her office, with the door closed — about CDI caseload realities, COMSEC account resource requirements, and unrealistic flight-schedule production goals. The Maintenance Officer who gets a pleasant GySgt instead of an honest one makes bad maintenance program decisions and the GySgt absorbs the outcome at the post-NAVINSGEN debrief.
  • ×Writing ambiguous FitReps that do not clearly support either the 1stSgt path or the MSgt/NAVAIR-SME path for an SSgt. The board reads ambiguity as an inability to develop subordinates deliberately. The SSgt who is competitive for neither board because the GySgt did not have the path conversation is the GySgt's development failure.
  • ×Neglecting the COMSEC audit cycle during a surge or deployment because 'we will clean it up at the next rotation.' The Communications Officer's semi-annual audit is not negotiable under MCO 5530.14 and it does not pause for the MEU workup. The GySgt who arrives at the audit cycle with a gap is the GySgt whose finding goes to the Commanding Officer in writing.
  • ×Going around the 1stSgt to the BSgtMaj with a division-internal problem. The BSgtMaj will tell the 1stSgt before you walk back to the shop. The working relationship between the avionics division GySgt and the 1stSgt is the MALS leadership foundation; one end-run destroys it and the BSgtMaj holds the GySgt accountable for the damage.

A Day in the Life

  • 0500Wake. Phone check for overnight issues across the division — any section chief who texted about a Liberty incident, a COMSEC safe anomaly, a GCSS-MC production alert, or a maintenance hold on a flight-critical communications system. Division of 15-30 Marines means something happens on most nights during surge periods. Brief the day's primary maintenance event and the COMSEC account status in your head before PT.
  • 0530PT formation. You take accountability for the division through the section chiefs. Every missing Marine is your immediate action item — not the section chief's escalation to you, your direct action with the section chief. The GySgt who is the last SNCO into the avionics division formation is the GySgt the BSgtMaj notes.
  • 0545–0700Unit PT. As avionics division GySgt you are setting the division's physical culture. The section chiefs watch your score at the PFT because their sections watch their scores. 1st-Class is the floor; the MALS knows if you are below it before the formal results post. MCMAP mat days on Wednesdays — you are the Black Belt Instructor running the session, not attending it.
  • 0700–0830Hygiene, chow. Walk the avionics shop before morning colors — not a formal inspection, a daily read of the shop's climate and the overnight maintenance status. How does the bench look? Are the outstanding work orders from yesterday's flight schedule still open? Is the COMSEC safe logged and secured? The GySgt who walks the shop before the Maintenance Officer arrives and catches the problem is the GySgt who solves it before the morning brief.
  • 0830Morning formation. The Commanding Officer or the officer of the day puts out the day's tasking. You brief the division's senior enlisted tier — section chiefs and senior Sgts — on the division's specific priorities. Not what the maintenance schedule says; what the division needs to accomplish today to be closer to CDI-program-clean, COMSEC-audit-ready, and T&R-completion-current.
  • 0900–1130Division work. Maintenance supervision — walking section-level bench events, watching section chiefs manage their techs, observing CDI sign-off procedures, checking TPI crypto fill documentation logs. You are two levels above the bench, which means the section chief owns the individual tech observation; your job is to observe the section chief's supervision quality and the division's aggregate technical standards. Administrative block — reviewing FitRep Section A drafts for SSgts whose cycle is approaching, COMSEC account daily health-check, GCSS-MC production review.
  • 1130–1300Chow. SNCO table — avionics GySgt, 1stSgt, and the MALS's senior SSgts. The chow hall conversation is the informal MALS staff meeting. What did each section chief see this morning? What does the Maintenance Officer need emphasized in the afternoon block? What did the BSgtMaj say at the wing morning brief that affects the afternoon's maintenance priorities?
  • 1300–1500Administrative and mentoring block. FitRep Section A drafts for SSgts whose cycle is approaching — drawn from the observation log maintained since the last cycle, not reconstructed from memory. Monthly COMSEC account health-check if this week's calendar slot is today. Monthly counseling sessions with SSgts on FitRep trajectory, path alignment, and Career Course status. SNCO Academy Advanced Course enrollment confirmed if not yet complete.
  • 1500–1630Final formation. The Commanding Officer or Maintenance Officer gives next day's plan. You brief the section chiefs. Sensitive items — crypto fill devices, KY-series equipment, COMSEC material — accounted through the section chiefs to you; any accountability discrepancy is resolved before the division releases. Tomorrow's primary maintenance events briefed to section chiefs with specific standards and CDI coverage assignments.
  • 1630Division release if on normal schedule. Liberty brief from you to the section chiefs, who relay to their sections. The COMSEC standards, the documentation requirements, and the overnight safe-check protocol are the standing brief — the GySgt who briefs them once per quarter and assumes retention has never answered the 0200 call from the duty tech who did not know the procedure.
  • 1700–2100Personal time. SNCO Academy Advanced Course CDET coursework if enrolled in the distance track. Family time. Second PT session if the morning was lighter than standard. The FitRep Section A work that requires unhurried attention — the path-aligned narrative for the SSgt whose board window is in four months — happens here if the afternoon block was consumed by a production surge.
  • After hoursSSgt section chief calls with a division-level issue — a COMSEC safe anomaly that requires the custodian-of-record's decision, a SAPR report that requires CO notification, a Marine in behavioral health crisis — are your calls. You route them correctly, brief the 1stSgt and the Commanding Officer in that order, and you are at the MALS by 0600 with the situation documented and the next action identified.
  • MEU deployment afloat or MCAS Iwakuni UDP rotationClock breaks. The avionics shop is operating at the deployed unit's maintenance tempo — aircraft on the flight schedule need communications systems maintained, the COMSEC account travels with the deployment, and the TPI and CDI documentation requirements do not pause because the ship is at sea. You are the senior NCO managing the division's maintenance production, the COMSEC account continuity, and the section chiefs' supervision quality in an expeditionary environment where the Maintenance Officer has fewer staff resources and is running harder. The deployment FitRep cycle runs on the same annual schedule regardless of location; the Section A you write on a deployed SSgt is the Section A the board reads.

Weekly Cadence

The GySgt avionics division chief's week runs on two parallel tracks — the maintenance production calendar and the program-management administrative calendar — and the discipline to keep both moving without one crowding out the other is the division chief's organizational signature. Monday morning the Maintenance Officer and the GySgt sit for 15 minutes before the morning formation. Not a formal briefing — a conversation about what the week's maintenance calendar needs to produce and what the Maintenance Officer needs to know about the avionics division before the MALS maintenance review on Thursday. The GySgt who shows up to that conversation with the week's maintenance schedule annotated against the CDI qualification coverage and the COMSEC account status is the GySgt the Maintenance Officer makes production decisions from. The GySgt who shows up with nothing specific is the GySgt the Maintenance Officer routes around to talk to the SSgts directly. Tuesday through Thursday is the maintenance supervision rhythm. The GySgt is not running the bench — that is the section chief's job. The GySgt is walking the avionics shop during each section's primary maintenance block, observing the section chief's supervision quality and CDI documentation discipline, noting what the section chief catches and what she misses, and giving direct feedback at the end of each event rather than waiting for the formal counseling cycle. The CDI program walkthrough — spot-check of two or three recent sign-offs against the originating tech's fault-isolation documentation, connector inspection records, and BIT pass verification — happens Tuesday morning and Thursday afternoon. What the GySgt catches on Tuesday is corrected by Wednesday, and the NAVINSGEN evaluator who walks the shop on Friday finds nothing. Friday is the administrative close. FitRep Section A drafts updated from the week's observation notes. Monthly counseling sessions with SSgts approaching a cycle close. COMSEC account health-check if the monthly calendar slot falls this week: inventory pull, TPI log review, destruction record confirmation. Division retention status reviewed — who is EAS-eligible in the next 90 days, which career-planner conversations need to happen, which reenlistment incentives in the current MARADMIN apply to the division's MOS. SNCO Academy coursework submitted if enrolled. Deployments — MEU PTP, UDP, CONUS-to-Okinawa rotation — collapse the Friday close entirely; the administrative accumulation is cleared in the 72 hours after return before the next event's calendar starts, and the GySgt who builds that reintegration window into the pre-deployment plan does not spend the first week back digging out from under an administrative backlog.

Key Skills — How to Drill Each

  1. 01
    Build and defend a MALS communications avionics maintenance training calendar that survives contact with the flight schedule, the deployment cycle, and the COMSEC audit window — NAVMC 3500.14-aligned, CDI qualification milestones built in, T&R event completion trackable by the Maintenance Officer at the weekly maintenance review.
    Pull the wing S-3 long-range training calendar first — the MEU PTP checkpoints, the NAVINSGEN inspection window, the COMSEC audit cycle dates. Build the division's quarterly training calendar backward from the inspection window: what CDI qualification events, what T&R collective tasks at what fidelity level, need to be documented and completed before the evaluators arrive? Assign bench events with specific systems scope (UHF/VHF transceiver qualification, IFF transponder fault-isolation, crypto fill TPI documentation), identify the GCSS-MC T&R event codes for each training block, and stage the blocks against the flight schedule's maintenance surge weeks. Brief the draft calendar to the Maintenance Officer before the MALS maintenance review submission; the Maintenance Officer who sees the training calendar for the first time at the wing BUB is the Maintenance Officer who finds the gap and asks why it is there.
  2. 02
    Write three to five SSgt FitReps per cycle that the senior reporting official can defend at the MALS and regimental FitRep board — clean Section A, defensible relative value, and path-aligned narrative for each SSgt's 1stSgt or MSgt/NAVAIR-SME trajectory.
    Maintain a running observation log on each SSgt avionics section chief — a physical or digital note that captures what you saw the SSgt do, in what maintenance or administrative context, with what measurable outcome. The FitRep cycle opens on a schedule; do not start writing Section A when the deadline is three days out. Draw from six months of observation notes to write in specific, action-result-impact language: 'SSgt [name] managed the COMSEC account semi-annual audit during the MEU PTP surge; zero findings submitted to the Communications Officer on schedule despite a 40-hour flight surge week' is a Section A sentence. Run a draft Section A by the Maintenance Officer 30 days before the FitRep deadline. The path conversation — 1stSgt or MSgt/NAVAIR-SME — needs to happen 12-18 months before the GySgt board window and be visible in the FitRep narrative.
  3. 03
    Run the COMSEC account as the custodian of record — key inventory, semi-annual audit, destruction records, transfer documentation, Two-Person Integrity logs, incident reporting — to MCO 5530.14 standards with zero findings submitted to the Communications Officer.
    The COMSEC account is a continuous-maintenance program, not an audit-week scramble. Maintain the key inventory current daily; close TPI documentation within 24 hours of each fill evolution; complete destruction records at the time of destruction, not the day before the audit. The semi-annual audit submission to the Communications Officer and CoSec is the product of a continuous process — not a two-week reconstruction. Build a monthly COMSEC account health-check into your calendar: pull the inventory against the custodian's records, verify the destruction log, confirm the transfer documentation is current. The GySgt who arrives at the audit cycle with the account current, ready to submit, three days before the deadline is the GySgt whose account has never generated a finding. The GySgt who reconstructs the audit the week it is due is the GySgt who finds the discrepancy the Communications Officer finds first.
  4. 04
    Mentor three or four SSgts toward Career Course completion and GySgt-board readiness; identify which are building toward the 1stSgt troop-leadership path versus the MSgt/NAVAIR-SME path, and write each FitRep cycle to align with the identified path.
    The path identification conversation happens at 12-18 months before the GySgt board window — not when the board cycle is announced. Pull each SSgt's FitRep record, composite score, and billet history. Which SSgts have FitRep narratives with strong troop-leadership indicators — discipline management outcomes, retention pipeline numbers, junior Marine development, family readiness? Which have narratives with strong COMSEC and CDI technical expertise indicators — account health records, CDI qualification rates, schoolhouse performance? Have the direct, individual conversation with each SSgt, in your office, about which path his record currently supports and which path his instincts pull toward. Then write the next FitRep cycle to align with that path — specifically, not generically. The SSgt who gets a path-aligned FitRep profile for two cycles before the GySgt board is competitive. The SSgt who gets a generic FitRep from a GySgt who never had the conversation is not.
  5. 05
    Brief the Maintenance Officer honestly on division NMC rates, CDI program health, COMSEC account status, T&R completion gaps, and personnel readiness trends she cannot see from the production-controller report.
    The Maintenance Officer's view of the division's technical health is filtered through the GySgt's weekly maintenance brief. Your role is to provide the honest assessment — not the assessment the Maintenance Officer wants to hear, but the one that enables her to make a sound decision about the flight schedule and the production goals. If the CDI qualification documentation is three months behind on two section chiefs because the deployment surge consumed every training window, she needs to know before the NAVINSGEN inspection brief. If the COMSEC account has a transfer documentation gap that will generate a finding at the semi-annual audit, she needs to know before the Communications Officer finds it. Schedule a standing 15-minute weekly brief with the Maintenance Officer — not a formal briefing, a direct conversation about the division's honest status. The GySgt who surprises the Maintenance Officer at the maintenance review is the GySgt whose brief she is already correcting before the wing BUB.
  6. 06
    Run a COMSEC incident notification — unauthorized access, loss of fill device, compromised crypto period — with the reporting chain, the timeline, and the documentation the Communications Officer, the CoSec, and the Commanding Officer require.
    Know MCO 5530.14's incident reporting requirements before the incident happens. The notification chain is: Communications Officer, CoSec, Commanding Officer — in that order, within the timeframe the regulation specifies. The COMSEC incident notification is not an after-action report; it is a time-critical documentation and reporting action that runs simultaneously with the immediate corrective actions. Pre-brief the notification chain requirements at the start of each deployment cycle — every SSgt and Sgt who handles COMSEC material should know the three-step chain before they touch a fill device. The GySgt who pre-briefs and posts the chain on the COMSEC safe is the GySgt whose division never delays a required notification because the on-duty tech did not know who to call.

Manuals & References — What Chapters Matter

  • NAVMC 3500.14 — Marine Aviation Training and Readiness Manual (Aviation Electronics series)
    Own this manual at the collective-task level — not just the individual technician qualifications, but the division-level and section-chief collective task list you build the quarterly training calendar against. The NAVINSGEN evaluator grades the division's T&R completion against the same task standards. The GySgt who builds the training calendar against the evaluation criteria, certifies each collective task before the evaluators arrive, and maintains the GCSS-MC T&R records current is the GySgt whose division passes the inspection without a training finding. Verify the current revision on Marines.mil before building the calendar; the T&R manual updates periodically and the division chief who is training against a superseded edition generates findings on tasks the current edition has changed.
  • MCO P4790.2C — Marine Corps Aviation Maintenance Management Program
    This is the governing directive for every maintenance management decision at the MALS level — CDI sign-off authority, QA division relationship, the documentation standards the Maintenance Officer enforces. At GySgt you are not reading this for your own compliance; you are teaching your SSgts and Sgts the policy structure and enforcing it across the division. The GySgt who cannot quote the CDI authorization chapter is the GySgt whose CDI program the Maintenance Officer has to rebuild. Verify the current revision; MCO P4790.2C has been updated across recent cycles and the GySgt who cites a superseded chapter number in the maintenance review is the GySgt the Maintenance Officer corrects in front of the production controllers.
  • MCO 5530.14 — COMSEC Physical Security Program
    At GySgt this is a personal accountability document, not a reference you consult at audit time. Read the custodian-of-record responsibilities chapter, the semi-annual audit procedures chapter, the incident reporting chain, and the Two-Person Integrity requirements before you assume the custodian billet — not after the Communications Officer identifies a gap. The sub-custodian procedures you enforced at SSgt are the foundation; the custodian responsibilities at GySgt add the audit submission obligation, the destruction record management cycle, and the incident reporting timeline to the CO. A GySgt who manages the COMSEC account as a continuous-maintenance program rather than an audit-week reconstruction is the GySgt whose account has never generated a finding.
  • MCO 1610.7 — Performance Evaluation System
    You write three to five SSgt FitReps per cycle and teach the FitRep system to your SSgts. At GySgt level, the relative value placement — where each SSgt sits in the competitive ranking of every SSgt in the MALS reporting chain — is the board-read metric that determines GySgt-to-MSgt and GySgt-to-1stSgt competitive candidacy. Understand the relative value mechanics before the first FitRep cycle opens, verify the current revision on Marines.mil, and run the path conversation with each SSgt 12-18 months before their board window so the Section A you write aligns with the path the FitRep needs to support.
  • MCO 1400.32 — Marine Corps Promotion Manual (GySgt-to-MSgt/1stSgt board mechanics)
    The MSgt/1stSgt board mechanics differ structurally from the GySgt board. Read the current edition for the competitive pool architecture, the billet-type weighting between troop-leadership and occupational-SME indicators, and the PME requirements specific to the E-8 board cycle. Pull the current MARADMIN for the board timeline and the FitRep snapshot dates — the GySgt who understands the snapshot dates builds the FitRep profile for the snapshot the board reads, not the cycle after it. The GySgt who understands the board mechanics is building a FitRep profile that aligns with the path he is targeting; the GySgt who is hoping the board reads ambiguity favorably is building the wrong product.
  • MCO 5354.1 — Sexual Assault Prevention and Response Program; MCO 1000.9 — Equal Opportunity
    At avionics division GySgt level, you are the senior NCO responsible for the division's SAPR and EO climate and reporting obligations. Both MCOs define the reporting timelines and the command response procedures the GySgt must enforce regardless of the relationship with the accused or the reporting Marine. A GySgt who manages a SAPR or EO incident incorrectly — delays reporting, counsels the reporting Marine informally, routes the incident around the SARC or EO Advisor to protect the section's maintenance production — is subject to the same accountability as the respondent in the resulting investigation. Know both policies and the installation SARC and EO Advisor contact information before the call comes in.

Standards — How to Hit Each

  • SNCO Academy Advanced Course (Career Course) graduate; Senior Course slated as MSgt/1stSgt board window approaches.
    The Advanced Course at the SNCO Academy (Marine Corps University, Camp Geiger NC) is the PME gate for the MSgt/1stSgt board. Complete the Advanced Course in-residence if the operational schedule permits; the network of GySgts from across the Marine Corps you meet in residence is professionally valuable for the rest of your career and the in-residence rigor is not replicated by the distance education track. Slate the Senior Course conversation with the BSgtMaj 18-24 months before the MSgt/1stSgt board window — the PME sequence matters for the board timeline. Verify the current PME mapping against MCO 1500.59 and the current MARADMIN before building the PME plan; the requirement has been updated in recent cycles.
  • Black Belt Instructor MCMAP — the avionics division GySgt is the senior instructor in the building for the physical training standard.
    Black Belt Instructor (MCMABI) certification is the expected MCMAP standard at GySgt avionics division chief level. The division's MCMAP sustainment program — belt tape tests, mat days, sustainment training events — runs through the GySgt's priority. The division chief who runs the MCMAP program personally, who schedules sustainment training around the flight schedule rather than canceling it because of the flight schedule, sets the physical culture standard the section chiefs enforce on their sections. Schedule the MCMABI certification through the MCICOM regional program if not already completed at SSgt; the BSgtMaj notices which GySgts have it and which are carrying a gap.
  • 1st-Class PFT and CFT; the avionics division watches the GySgt's score, and an aviation maintenance GySgt who cannot pass the standard loses credibility before the first maintenance review.
    At GySgt the fitness standard carries a different institutional weight than at SSgt. The GySgt who fails to score 1st-Class on the PFT is the topic of every NCO in the MALS — not as gossip, but as a leadership credibility signal the section chiefs read against their own sections. Protect the fitness program the way you protect the training calendar: scheduled, prioritized, and non-negotiable in the weekly schedule. The CFT matters to the 5939 community because avionics maintenance on deployment — equipment carry, expeditionary airfield set-up, flight line work under surge conditions — is a physical job. Train the CFT events specifically; the ammunition can lift and the maneuver under fire sequence replicate the physical demands of a maintenance surge better than running alone.
  • COMSEC account audit clean for every semi-annual cycle with zero findings — the Communications Officer and the CoSec both sign the audit result, and the Commanding Officer sees the finding if one exists.
    The zero-findings COMSEC audit is a process outcome, not a pre-audit scramble. The GySgt who manages the account as a continuous-maintenance program — inventory current, TPI logs closed within 24 hours, destruction records complete, transfer documentation current — arrives at the semi-annual audit with nothing to reconstruct. Build a monthly COMSEC account health-check into the training calendar: 30 minutes at the safe, pull the inventory against the custodian's records, verify the logs. Three consecutive clean audits under a GySgt custodian are visible to the BSgtMaj and the wing communications officer, and they travel in the FitRep narrative. One finding at audit, addressed to the Commanding Officer in writing, is also visible — for different reasons.
  • FitRep profile the senior reporting official can defend at the MSgt/1stSgt board — relative value, attributes, and narrative rationale aligned to either the troop-leadership or the NAVAIR/NATTC-SME path across three cycles.
    The FitRep at GySgt is the product of three things: the quality of the Section A input on your SSgts, the Maintenance Officer's attribute marks and comparative narrative, and the MALS CO's reviewing officer endorsement. The GySgt who writes clean, path-specific Section As gives the Maintenance Officer the material to write a comparative narrative that places each SSgt correctly in the competitive pool. The GySgt whose Section As are ambiguous gives the Maintenance Officer nothing to differentiate with, and the MSgt/1stSgt board reads that ambiguity as a failure to develop subordinates toward a defined professional trajectory.

Technical Mistakes — Concrete Consequences

  • Stopping the CDI qualification walkthrough on the SSgt section chief you trust most.
    The SSgt who has been consistently clean is not a lower-risk SSgt — he is an SSgt whose consistent CDI performance has been validated by your supervision. When the walkthrough stops and the CDI documentation program slides, the first indication is typically a NAVINSGEN CDI audit finding or a QA division challenge on a contested sign-off. The NAVINSGEN investigation names the avionics division GySgt as the SNCO responsible for the CDI program oversight; 'I trusted him' is not a finding that reduces culpability in the inspection report.
  • Carrying a personal conflict with a peer GySgt in the MALS into the division's working relationships.
    The BSgtMaj notices within weeks. The Maintenance Officers talk. The FitRep comparative pool includes GySgts from across the MALS, and a division chief who has a visible professional conflict with a peer GySgt creates a wing-level climate problem that the BSgtMaj manages by assigning the harder billet to the GySgt who cannot operate professionally with his peers. The FitRep board reads the downstream relative value placement without the conflict explicitly named but with the comparative narrative shaped by it.
  • Allowing a known SAPR or EO incident to be handled informally to protect the division's maintenance production timeline.
    MCO 5354.1 SAPR reporting timelines and MCO 1000.9 EO investigation requirements are not suspended by a MEU PTP workup or a NAVINSGEN preparation surge. A GySgt who routes a SAPR or EO incident informally to protect the production timeline is subject to the same investigation outcome as a failure to report — and the investigation that opens six months later, when the reporting Marine escalates to the IG, is an investigation that names the GySgt as the supervising SNCO who chose the flight schedule over the Marine.
  • Submitting an ambiguous FitRep profile for an SSgt that does not align with either the 1stSgt or MSgt/NAVAIR-SME board criteria.
    The MSgt and 1stSgt boards read two separate FitRep criteria sets from the same competitive pool. An SSgt whose FitRep profile is ambiguous — technically strong in some indicators, administratively strong in others, but not clearly dominant in either — is the SSgt who is competitive for neither board on the first look. The GySgt who created that ambiguity by not having the path conversation and not writing accordingly has produced an SSgt in zone for a second board cycle who did not achieve his potential because the GySgt did not do his job.
  • Skipping the SNCO Academy Advanced Course PME because the operational schedule is consuming every available training window.
    The MSgt/1stSgt board reads PME completion against every peer GySgt in the competitive pool. A GySgt who is not SNCO Academy Advanced Course-complete when the board meets is disadvantaged in relative value against every peer who is complete — and there is no FitRep narrative that compensates for a visible PME gap in a pool where most competitive candidates are PME-complete. Every MALS operational schedule is busy; the GySgt who lets the schedule eat the Advanced Course slot for three consecutive years arrives at the board cycle with a gap that cannot be closed.

Career Decisions at This Rank

  • 1stSgt troop-leadership path versus MSgt/MGySgt NAVAIR-SME path — the defining career decision of the GySgt rank
    The Marine Corps promotes to 1stSgt (E-8 troop leadership) and MSgt (E-8 occupational SME) from the same GySgt pool but reads different FitRep criteria for each. The 1stSgt path reads: troop-leadership competency — discipline outcomes, retention rates, junior Marine development, family readiness, MALS company climate. The MSgt/MGySgt path reads: 5939 occupational technical expertise — COMSEC account health across multiple cycles, CDI program rigor, NAVINSGEN performance results, NAVAIR program participation, schoolhouse or staff billet performance. The GySgt who has spent a decade in avionics shops and has the technical instincts should build the MSgt profile deliberately; the GySgt who has spent a career running formations and building junior Marines should build the 1stSgt profile. The board reads what the FitRep says — not what the Marine believes about himself. Have the path conversation with the BSgtMaj about which direction your current record supports; then build the next FitRep cycle to align with that path, not to preserve optionality.
  • B-billet or operational billet for the final GySgt cycle before the MSgt/1stSgt board
    The final GySgt billet before the board is the one the board reads as the most current performance indicator. A GySgt whose final billet is MALS avionics division chief during a high-intensity MEU PTP workup and deployment has a different board read than a GySgt whose final billet is an NATTC Pensacola instructor billet in the 5939 course pipeline. The schoolhouse billet — NATTC Pensacola as a 5939 course instructor, the Marine Aviation Weapons and Tactics Squadron 1 (MAWTS-1) communications avionics support billet, or a COMSEC program staff billet at MARFORPAC or MARFORCOM — is the NAVAIR/NATTC-SME path's board differentiator. The operational billet — MALS avionics division chief on a deployed MEU or Okinawa UDP — is the troop-leadership path's board differentiator. Work the final billet choice through the BSgtMaj with the path conversation already completed — as a career plan with a documented rationale, not a casual preference.
  • SNCO Academy Advanced Course timing — in-residence versus CDET for the final PME gate before the MSgt/1stSgt board
    The Advanced Course in-residence at the SNCO Academy is the GySgt-level PME standard. The MSgt/1stSgt board reads PME completion; the GySgt who arrives at the board window without the Advanced Course complete is disadvantaged against every peer who has it. In-residence is better than CDET for the rigor and for the network of GySgts from across the Marine Corps you meet at Camp Geiger. If the operational schedule makes in-residence impossible — MEU deployment consuming every available window for two consecutive years — enroll in CDET immediately rather than waiting for a clean in-residence opening. The board does not distinguish between completion methods. The GySgt who let the schedule consume three consecutive in-residence windows without enrolling in CDET arrives at the board window with a gap that cannot be closed in time.
  • Post-service transition planning — when to start building toward Collins Aerospace, L3Harris, Raytheon, or NAVAIR GS-13
    By GySgt with 15-16 years of service, the 20-year retirement calculation is clear and the post-service plan should be running in parallel. The primary 5939 civilian transition market is the defense aviation electronics sector: Collins Aerospace (avionics systems and communications products), L3Harris Technologies (tactical radio and communications systems, IFF systems, COMSEC solutions), and Raytheon Technologies (avionics, comms, and EW systems integration) all actively recruit senior enlisted avionics technicians with crypto and IFF maintenance credentials. The secondary market is the federal civil service: NAVAIR's aviation communications and avionics program offices at NAVAIR Lakehurst, Patuxent River, or China Lake recruit GS-11 to GS-13 avionics program analysts from the senior NCO community. The SkillBridge program (DoD-authorized industry internship during the final 180 days before EAS) is the bridge between the last billet and the civilian placement; identify the defense contractor or NAVAIR program office SkillBridge partner 24 months before EAS, not 60 days out. VA disability claim pre-filing starts at 90 days before EAS under the Benefits Delivery at Discharge program — start the documentation now.

How the Seat Varies by Unit Type

  • MALS avionics division chief — active component, MCAS Cherry Point, Beaufort, Miramar, or Yuma
    The standard GySgt 5939 billet. You run the communications avionics division in a Marine Aviation Logistics Squadron supporting fixed-wing or rotary-wing aircraft. The maintenance cycle runs around the wing's flight schedule and the MEU PTP workup cycle — surge weeks when the flight schedule pushes the division hard, followed by reset periods where the T&R schedule and the CDI qualification program catch up. The FitRep pool is every GySgt in the MALS; the BSgtMaj knows every division chief by name, and the regimental SgtMaj knows the top performers. The NAVINSGEN inspection cycle is the division chief's primary institutional evaluation event.
  • NATTC Pensacola course instructor — 5939 avionics electronics pipeline
    The NATTC Pensacola instructor billet is the NAVAIR/NATTC-SME path's most visible GySgt assignment. You are teaching the 5939 course curriculum to every new Marine aviation communications tech who comes through the pipeline — the fault-isolation procedures, the COMSEC handling disciplines, the CDI-quality documentation standards that will define the next generation's performance in the MALS. The FitRep from the schoolhouse is signed by a schoolhouse officer rather than a Maintenance Officer; the competitive pool is the NATTC GySgt instructor pool, smaller than the MALS pool with higher individual visibility. The GySgt who leaves NATTC after a clean instructor tour with curriculum development credits and a strong FitRep is the GySgt the MSgt/MGySgt board reads as a program-level contributor.
  • MAWTS-1 or wing-level avionics staff billet
    The Marine Aviation Weapons and Tactics Squadron 1 (MAWTS-1) at MCAS Yuma, and wing-level aviation communications staff billets at Marine Aircraft Wings, place the GySgt in direct contact with the NAVAIR program process, the communications systems architecture decisions, and the doctrine development activities that shape the 5939 community's standards for years. The FitRep from this billet is signed by a field-grade officer in the wing or the MAWTS-1 command structure and is read by the MSgt/MGySgt board as a program-level fires-SME indicator. The GySgt who is the communications avionics technical authority that the wing's operations officer calls for the complex spectrum management question is the GySgt the board reads favorably.
  • 12th Marines / III MEF avionics support — forward deployed Okinawa
    A MALS avionics division chief billet with Marine Aircraft Group 36 at MCAS Futenma or the III MEF aviation communications staff at Camp Courtney puts the GySgt in the Indo-Pacific operational environment. The maintenance cycle includes JMSDF and JASDF combined training exercises, Korea Marine Corps partner-force exchanges, and the III MEF contingency posture that distinguishes Okinawa from CONUS MALS assignments. Family separation for an unaccompanied Okinawa tour is a real retention and morale factor — the GySgt who manages the family readiness program deliberately before and during the UDP comes back with a different retention outcome than the one who does not. The FitRep pool is smaller on Okinawa; individual performance visibility to the BSgtMaj and the regimental SgtMaj is higher.
  • Reserve component MALS or aviation communications staff
    Reserve GySgt 5939 division chiefs manage the training calendar in a compressed-hours environment. Monthly drill weekends plus annual training provide the primary windows for CDI qualification events, COMSEC account audit cycles, and T&R collective task completion. Reserve GySgts competing for the MSgt/1stSgt board in the reserve competitive pool face a different relative value calculation than active-component peers — verify the current reserve component selection guidance and board criteria with the reserve career counselor before building the candidacy plan. The COMSEC account obligations do not pause between drill weekends; the custodian-of-record is accountable whether the account is at an active-duty MALS or a reserve-component aviation communications element.

What Good Looks Like at This Rank

The good 5939 GySgt is the avionics division chief the BSgtMaj sends to the worst billet in the wing — the MALS detachment chief deploying with a new Communications Officer, the avionics section recovering from a COMSEC account finding, the NAVINSGEN preparation shop that has not had a permanent GySgt in six months — because the division comes out of it better than it went in. He does not need the section to already be good to add value; he builds the standard from whatever the MALS gives him. His SSgts know which path they are building toward because he told them 12 to 18 months out and has been writing Section A to match ever since. The 1stSgt candidate's FitRep profile has discipline management outcomes, retention pipeline numbers, and family readiness indicators in every narrative. The MSgt/NAVAIR-SME candidate's FitRep profile has COMSEC account health records, CDI qualification rates, NAVINSGEN inspection results, and the technical program-management competency indicators the NAVAIR and NATTC-SME boards read. The ambiguity was resolved before the board cycle opened, and the SSgts are competitive because of it. The Maintenance Officer walks into the weekly maintenance review with the avionics division brief in hand and does not make an apology. The T&R completion rate is documented in GCSS-MC, the CDI qualification coverage is current, the COMSEC account is clean, and the NMC trend line is moving in the right direction. The BSgtMaj reads the division's maintenance health-of-the-force inputs at the quarterly review and asks the Maintenance Officer who runs the 5939 division. The Maintenance Officer says the GySgt's name. That answer is the division chief's career product.

Preview — The Next Rank

MSgt and 1stSgt are structurally different jobs at the same pay grade in the 5939 community. The 1stSgt of a MALS company runs 100-200 Marines — the full administrative, personnel, and discipline layer below the Commanding Officer. You are the troop leader; the CO leads and you run the formation. The MSgt in the 5939 NAVAIR-SME track is the wing-level communications avionics staff senior enlisted, the NAVAIR program office SME, the NATTC schoolhouse commandant's senior technician, or the 5939 occupational specialty advisor at MMPB — the senior program manager whose technical read shapes the standards the next generation of division chiefs is evaluated against. The SgtMaj trajectory from 1stSgt is the troop-leadership summit: 1stSgt of a MALS company → SgtMaj of the MALS or the Marine Aircraft Group. The MGySgt trajectory from MSgt is the technical program summit: MSgt wing-level communications staff → MGySgt master avionics technician billet at NATTC or MMPB 5939 occupational specialist. Both paths converge when the MALS SgtMaj and the wing MGySgt sit in the same aviation readiness review — the SgtMaj advising the Commanding Officer on enlisted climate and the MGySgt advising on occupational specialty standards and training program integrity. The board read at the MSgt/1stSgt level is the product of every FitRep you have written, every billet you have held, and every PME gate you have completed since SSgt pin-on. The GySgt who arrives at the board cycle with a clear path alignment — 1stSgt or MSgt/NAVAIR-SME — visible in every FitRep narrative, every billet type, and every PME gate is the GySgt who is competitive. The GySgt who arrives with an ambiguous record — good across many things, dominant in nothing — is the GySgt who sits in zone for an extra cycle while the board asks a question his FitRep should have already answered.
FAQ

5939 E7 — Frequently Asked Questions

Q01What does a E7 5939 (Aviation Communication Systems Technician) actually do?
You run the MALS communications avionics maintenance program — or the avionics division of a squadron — as the senior NCO and the COMSEC account custodian.
Q02What's the most important thing to know as a E7 5939?
GySgt in the 5939 community is the MALS avionics/comms division chief rank — full communications maintenance program authority, COMSEC account custodian of record, and the senior NCO above a section of 15-30 Marines.
Q03What does a typical day look like for a E7 5939?
Time-blocked day at the E7 5939 rank tier: 0500 Wake. Phone check for overnight issues across the division — any section chief who texted about a Liberty incident, a COMSEC safe anomaly, a GCSS-MC production alert, or a maintenance hold on a flight-critical communications system. Division of 15-30 Marines means something happens on most nights during surge periods. Brief the day's primary maintenance event and the COMSEC account status in your head before PT, 0530 PT formation. You take accountability for the division through the section chiefs.…
Q04What mistakes get E7 5939 soldiers fired or relieved?
Letting one SSgt section chief drift because you trust him. That is the section the NAVINSGEN CDI audit flags and the GySgt absorbs at the wing maintenance review debrief. The GySgt who stops walking the section he trusts most is the GySgt who gets the worst COMSEC finding at the worst inspection; Confusing being tight with the Maintenance Officer with being aligned with the Maintenance Officer. She needs you to push back honestly — in her office,…
Q05What career decisions matter most at the E7 5939 rank tier?
1stSgt troop-leadership path versus MSgt/MGySgt NAVAIR-SME path — the defining career decision of the GySgt rank — The Marine Corps promotes to 1stSgt (E-8 troop leadership) and MSgt (E-8 occupational SME) from the same GySgt pool but reads different FitRep criteria for each. The 1stSgt path reads: troop-leadership competency — discipline outcomes, retention rates, junior Marine development, family readiness, MALS company climate. The MSgt/MGySgt path reads: 5939 occupational technical expertise — COMSEC account health across multiple cycles, CDI program rigor, NAVINSGEN performance results,…
Q06What's next after E7 for a 5939 (Aviation Communication Systems Technician) in the Marines?
MSgt and 1stSgt are structurally different jobs at the same pay grade in the 5939 community.
Q07What manuals and regulations does a E7 5939 need to know cold?
NAVMC 3500.14 — Marine Aviation T&R Manual (MALS-level collective tasks you build the training plan against; you teach the next generation off this standard).; MCO P4790.2C — Aviation Maintenance Management Program (maintenance program authority, CDI sign-off policy, QA relationship — you enforce this, not just read it).; MCO 5530.14 — COMSEC Physical Security Program (custodian-of-record responsibilities, audit cycle,…

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