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5939E6

Aviation Communication Systems Technician

E-6 (Staff Sergeant) · Marines

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

You are the primary COMSEC account custodian now — not the sub-custodian, not the backup. Every key in the account, every destruction record, every TPI log entry, and every incident report that goes to the Communications Security Officer has your name on it. The semi-annual audit does not ask the Maintenance Officer how the account was run. It asks you. Own the account the way you own the shop: proactively, in writing, with nothing discovered that you did not already know.

The Honest MOS Read
Staff Sergeant in the MALS communications avionics section is the shop chief rank — or the senior CDI authority in a larger communications avionics division. The billet on paper says 'avionics shop chief' or 'communications systems section chief.' What it means in practice is that you run the section's maintenance production, quality assurance program, COMSEC account, FitRep cycle, and personnel readiness across a shop of eight to twelve Marines and two or three Sgt section chiefs. Every CDI signature produced in the section reflects the program you built. Every COMSEC entry the Communications Security Officer audits was either generated under your account management or discovered in an audit you should have caught first. The COMSEC account moves to you at SSgt — not incrementally, not shared. You are the primary account custodian. At Sgt you were the sub-custodian running TPI evolutions and managing the destruction log. At SSgt the account holder — the Communications Security Officer or the Communications Officer — has formally designated you as the primary custodian of record, and the full scope of MCO 5530.14 account management is your accountability. Key inventory is quarterly at minimum. Semi-annual audit is documented and reported to the Communications Security Officer in writing before the cycle date, not after. Fill device transfer documentation is complete before any device moves between accounts. Destruction records are current, signed, and filed in the account package within 24 hours of the destruction event. Any deviation from the expected account state — a fill device whose serial number does not reconcile, an audit cycle that has run past the due date, a TPI log entry with an incomplete signature block — is a self-reported COMSEC incident that goes to the Communications Security Officer the same day you find it. Discovered-in-audit is never the answer when you are the custodian. The custodian who self-reports an account irregularity immediately and presents a corrective action plan is in a different accountability conversation than the one whose irregularity is found by the Communications Officer's quarterly spot-check. The MALS production meeting is your arena at SSgt. The Maintenance Officer briefs the day's aircraft status and maintenance priorities; you brief your shop's CDI production capability, maintenance event workload, and T&R completion status. If a section of yours is behind on CDI event documentation, the production meeting is where the Maintenance Officer finds out — from you, with a recovery plan, not from the QA representative's sample report. The SSgt shop chief who shows up to the production meeting having already talked to the Sgt whose section has the open issue is the SSgt who controls the narrative. The one who hears about it from the Maintenance Officer is the one who is playing defense in front of the section's leadership for the rest of the cycle. FitRep writing at SSgt operates at a different scope than at Sgt. You are writing Section A input on your Sgts — the section chiefs who run the sections under you. The Section A for a Sgt section chief describes what that Sgt did to manage the section's CDI program, the COMSEC account, the T&R calendar, and the junior Marine development pipeline. Specific: aircraft tail numbers, CDI sign-off counts, COMSEC audit results, how many Cpls promoted to Sgt under that section chief's tenure. Not general: 'excellent section chief with outstanding technical skills.' The Maintenance Officer builds the formal FitRep attribute evaluation and the relative value placement on top of your Section A input. A Section A that gives the Maintenance Officer nothing specific to work with produces a FitRep that does not differentiate at the GySgt board. A Section A that describes what each Sgt's section produced, by the numbers, is the input the Maintenance Officer can use to argue for a 'must select' relative value at the MALS FitRep board. NATTC instructor billet becomes a realistic conversation at SSgt. The 5939 course at NATTC Pensacola runs continuously; the school needs experienced SSgts who have run MALS avionics sections, managed COMSEC accounts, and developed CDI programs. An instructor billet is a 2-to-3-year tour in which you shape the technical foundation of every 5939 Marine who comes through the pipeline. The FitRep profile for an NATTC instructor tour is different from the MALS production tour — both are valued, but the instructor tour identifier carries weight at the GySgt board that the production tour alone does not replicate. Talk to the Maintenance Officer and the career planner about timing before the GySgt window closes. Defense contractor pipeline awareness starts at SSgt. Raytheon, L3Harris, Collins Aerospace, and the major avionics systems integrators recruit directly from the Marine Corps SSgt and GySgt ranks for field service representative, depot maintenance, and systems integration roles. The 5939 SSgt with eight to ten years of MALS production experience, a current COMSEC account management record, and CDI program management experience across multiple aircraft platforms is a competitive applicant for roles that pay significantly more than O-3 equivalents at DoD contractors. This is not an argument to EAS. It is an argument to understand the market before the SkillBridge timing conversation. SkillBridge is available at 180 days before EAS; the SSgt who approaches SkillBridge with a target company, a target role, and a current LinkedIn profile built on real MALS achievements is in a different position than the one who discovers the program at 90 days.
Career Arc
  • 01SSgt pin-on via centralized SNCO selection board under MCO 1400.32 — shop chief or senior CDI authority billet assumption in the MALS communications avionics section.
  • 02COMSEC account primary custodian designation by the Communications Security Officer — full account management scope assumed: key inventory, semi-annual audit, destruction records, fill-device transfer documentation, incident reporting.
  • 03First full FitRep cycle as SSgt — Section A input on each Sgt section chief written, relative value placement discussed with the Maintenance Officer, GySgt board implications understood before the first cycle closes.
  • 04MALS production meeting integration — shop status briefs, CDI program quality reports, T&R completion briefings to the Maintenance Officer weekly; known as the SSgt who controls the narrative rather than reacts to it.
  • 05GySgt selection board competitiveness window — FitRep relative value trend across SSgt cycles, COMSEC account audit history, CDI program management record, Gunnery Sergeant Course PME slot, potential NATTC instructor billet on the timeline.
  • 06B-billet and instructor billet timing decision — NATTC Pensacola instructor tour, DI duty at MCRD (GySgt board marker), or continued MALS production through the GySgt window.
  • 07SkillBridge / defense contractor pipeline awareness — L3Harris, Raytheon, Collins Aerospace field service representative track; 180-day SkillBridge window timing relative to EAS date.
Common Screwups
  • ×COMSEC account irregularity discovered by the Communications Officer's spot-check rather than self-reported by the custodian. At SSgt you are the primary account custodian of record. An account irregularity found by the Communications Officer goes to the CO in writing with your name as custodian. A self-reported irregularity with same-day notification and a documented corrective action is a different narrative — you still brief the CO, but you control the brief. The SSgt custodian who has never self-reported an irregularity does not have a clean account; she has an account that has not been audited carefully enough to find the problem.
  • ×NJP, DUI, or fraternization at SSgt. UCMJ action at SSgt initiates administrative separation proceedings in most cases; the shop chief billet is transferred, the COMSEC account is transferred to a new custodian, and the GySgt board is foreclosed for the current cycle. The section you built is someone else's problem. This is the rank at which a single off-duty decision ends a carefully built twelve-year career.
  • ×FitRep Section A narratives that describe Sgts in general terms — 'outstanding NCO with exceptional leadership' — rather than specific observed performance. The Maintenance Officer who receives three Section A inputs that all use the same language has no basis to differentiate relative value at the MALS FitRep board. The Sgt whose Section A reads identically to the other two Sgts' Section As gets an average relative value mark by default, regardless of actual performance. The SSgt shop chief who fails to give the Maintenance Officer specific, differentiated Section A input is the SSgt who has wasted the FitRep cycle for every Sgt in the section.
  • ×Hiding a CDI program quality problem from the Maintenance Officer to protect the shop's reputation. The QA representative's semi-annual sample report goes to the Maintenance Officer whether you surface the issue or not. The SSgt who tells the Maintenance Officer about a CDI documentation pattern issue in the Monday morning production meeting — with the corrective training event already scheduled — is in a different accountability position than the one the QA representative briefs first. The shop's reputation is built on producing clean work, not on appearing to produce clean work.
  • ×Missing the Gunnery Sergeant Course PME slot through schedule conflicts that were not tracked or recovered. The GySgt selection board reads PME completion. An SSgt who is not Gunnery Sergeant Course-complete when the board meets is visible in the relative value comparison. Schedule the slot through the Maintenance Officer 90 days before the course drop date; when the MALS maintenance surge or a deployment window consumes the available slot, the recovery timeline goes on the shop chief's calendar that day — not at the next PME briefing.

A Day in the Life

  • 0500Wake. Check the section group chat and the Maintenance Officer's overnight message log — any aircraft status changes, COMSEC safe access events, or personnel issues that affect the morning production meeting brief. PT uniform, head to the MALS.
  • 0530PT formation. Take shop accountability from the Sgt section chiefs and report to the Maintenance Officer or senior NCO. The SSgt who is the last NCO into formation is the SSgt the Maintenance Officer notes. Report accountability clean — any missing Marine in the section is your problem before it becomes the Maintenance Officer's.
  • 0545-0700Unit PT. You set the pace and the tone for the shop's physical culture. The shop whose SSgt runs at the front and finishes at 1st-Class pace sets a different expectation for the section chiefs than the shop whose SSgt jogs in the middle. Wednesday may be the MALS group run; Thursday may be the shop-led PT block you built the plan for.
  • 0700-0830Hygiene, chow, utilities. Pull the GCSS-MC work order queue and the T&R event calendar before the morning production meeting. Review the COMSEC account log for any entries generated overnight. Build the shop status card for the production meeting brief — CDI workload by section, T&R completion rate, COMSEC account status, any open quality issues with a corrective action status. The Maintenance Officer should not have to ask for this information.
  • 0830MALS production meeting. Maintenance Officer briefs the day's aircraft priorities. You brief shop status. The Sgt section chiefs receive their task assignments from you; they brief their sections before 0930. If a section has an open quality issue or a CDI program gap, it is in your brief with a corrective action plan — not surfaced for the first time at the meeting.
  • 0900-1130Shop management cycle — walk the sections, spot-check CDI documentation in progress, verify TPI log entries on any crypto fill evolutions, review GCSS-MC T&R event entries from the previous day. Not managing over the Sgt section chiefs' shoulders — spot-checking to verify the section is running the way you briefed it. The shop chief who walks the floor every morning and asks good questions creates a different section culture than the one who reviews reports from the office.
  • 1130-1300Chow. You eat with the senior NCO group. Maintenance Officer and shop-level NCOs are at the adjacent table. These conversations are not idle — you are hearing the informal operational picture and the Maintenance Officer's unfiltered assessment of shop performance. The shop chief who is present at lunch is the one who hears about issues before they become production meeting topics.
  • 1300-1500Administrative cycle — FitRep Section A drafts for Sgts whose rating period ends this quarter, monthly counseling sessions with each Sgt (FitRep profile review, SSgt board development plan status, COMSEC account management assessment), CDI program review for any authorization approaching annual review deadline, GCSS-MC T&R event audit. Gunnery Sergeant Course coursework if enrolled.
  • 1500-1630Final production meeting. Maintenance Officer's next-day plan. Sensitive items — crypto fill devices, classified publications — verified and secured. Shop accountability from Sgt section chiefs. Hand each Sgt a priority card for tomorrow with specific tasks and the standards for each. Any COMSEC safe access event today is documented in the account log before the safe closes.
  • 1630Liberty call on normal schedule. You give the shop the standard brief on the same day every week — liberty standards, DUI consequences, call the shop chief first. The Sgt section chiefs give their sections the same brief on your authority. Consistency matters: the section that hears the same brief every week treats it differently than the section that hears it when the shop chief remembers.
  • 1700-2000Personal time — Gunnery Sergeant Course coursework, FitRep Section A draft work, COMSEC account self-audit preparation for the approaching cycle, MCMAP Black Belt sustainment training, SkillBridge research if the EAS horizon is within 24 months. The SSgt who uses personal time to close the GySgt board gaps is the SSgt who arrives at the board window with nothing left on the table.
  • 2000-2200If a Sgt section chief or a junior Marine calls with a problem — financial, marital, legal, behavioral health — you are on the phone or you are driving there. Route the problem to the correct resource: MCCS PFMP for financial, Legal Assistance at the base law center for legal, Branch Medical or Behavioral Health for mental health, battalion chaplain for pastoral. The shop chief who routes the problem to the right resource within 24 hours is the shop chief whose Maintenance Officer never hears about it from the 1stSgt.
  • COMSEC SEMI-ANNUAL AUDIT periodTwo to three days of focused account management work. Key inventory completed against the account record, TPI log reviewed for completeness, destruction records verified and filed, fill device transfer documentation current. Run the self-audit checklist against the MCO 5530.14 criteria before the Communications Security Officer arrives. The custodian whose self-audit is complete 48 hours before the scheduled audit date walks into the audit with nothing to discover. Any discrepancy found during self-audit is self-reported to the Communications Security Officer before the formal audit begins.
  • PRE-DEPLOYMENT surge periodMaintenance tempo doubles; TPI evolutions run daily; the GCSS-MC queue runs deep. Documentation discipline is the shop chief's constant — the T&R event entries happen day-of even when the flight schedule is pushing 14-hour days, the COMSEC account log is updated after every safe access, and the CDI sign-off documentation is reviewed at end of each day rather than end of week. The shop chief who maintains documentation discipline through a pre-deployment surge is the shop chief whose post-deployment QA audit is a one-day review, not a two-week reconstruction.

Weekly Cadence

Monday is the SSgt's planning and management day. The Maintenance Officer's production meeting gives the week's maintenance priorities; you translate those into shop task assignments before the section chiefs brief their sections. The shop status card — CDI workload, T&R completion rate, COMSEC account status, open quality items — is built from GCSS-MC data Monday morning before the meeting, not reconstructed from memory at the meeting. Brief the Sgt section chiefs before 0900, on the shop floor, with specific task expectations for the week. The section that is still asking the shop chief what to do at 1000 on Monday is the section the Maintenance Officer notices. Tuesday through Thursday is the management and administrative production rhythm. Walk the sections daily — not to supervise over the Sgt section chiefs' shoulders, but to spot-check CDI documentation discipline, verify GCSS-MC T&R entries are current, and confirm the COMSEC account log was updated after every safe access. Monthly counseling sessions with each Sgt section chief run in parallel with the maintenance production calendar — draft FitRep Section A language from Monday's production events by Wednesday, revise based on what you observe through Thursday, submit before the reporting cycle deadline. The SSgt who is running FitRep drafts on a four-weeks-ahead schedule is the SSgt who produces clean Section A input; the one who drafts Section A the week it is due is the one who produces general language that the Maintenance Officer revises. Friday closes the week's administrative cycle. Sensitive items verified and secured. GCSS-MC work order status current across all sections. T&R event completion rate reviewed against the NAVMC 3500.14 cycle — any missed events with a scheduled makeup on the following week's calendar. COMSEC account log reviewed for completeness. Monthly composite score review for each Sgt section chief, with the SSgt board development plan updated where any variable has moved. The SSgt who closes the week with these items current is the SSgt whose Maintenance Officer can take a weekend off with confidence. Pre-deployment surges and MALS maintenance surge cycles compress this cadence entirely. The shop chief's job during surge is to ensure documentation discipline does not slip under operational tempo — because the post-surge audit runs from the records that were generated during the surge, and a shop that produced clean documentation under surge conditions is the shop the Maintenance Officer uses as the standard for the next shop chief rotation.

Key Skills — How to Drill Each

  1. 01
    Execute full COMSEC account management as primary custodian — key inventory, semi-annual audit, destruction records, fill-device transfer documentation, incident reporting — with the account state self-verifiable before any audit.
    Build an account management calendar on day one: semi-annual audit dates marked 60 days out (not 30), quarterly key inventory dates marked, destruction record review dates at end of each month. Before each scheduled audit, run a self-audit against the same checklist the Communications Security Officer uses — every fill device serial number reconciled against the account record, every TPI log entry complete with both signatures, every destruction record signed and filed. The self-audit takes half a day if the account is current and maintained continuously; it takes three days if the account has been allowed to drift and the records require reconstruction. The custodian whose self-audit finds nothing the Communications Security Officer does not already know about is the custodian whose COMSEC reputation is clean. The standard to aim for is that when the Communications Security Officer calls for the account status, you can brief it from memory to the decimal — how many fill devices in the account, what the last key period loaded was, when the last destruction event occurred, what the next audit date is.
  2. 02
    Manage the shop's CDI program as the authorizing authority — qualification packages, systems scope documentation, annual review cycles, QA sample audits — with every active CDI's training jacket current before the QA representative asks.
    At SSgt you are the CDI program manager for the section, not just a CDI yourself. Every CDI working under your shop chief authority has a training jacket that documents the qualification standard used, the systems scope, the qualification date, and the annual review result. Before the QA representative's semi-annual sampling visit, pull every active CDI's training jacket and verify that the annual review is current, the systems scope is accurate for the platforms they are actually signing off, and the sign-off error rate for the last 90 days is at or below the shop standard. A CDI whose annual review has lapsed is not an authorized CDI — work performed under a lapsed authorization is a maintenance program violation. The SSgt who catches lapsed authorizations before the QA representative does is the SSgt whose shop has a clean program. The one the QA representative briefs to the Maintenance Officer is not.
  3. 03
    Brief the MALS production meeting with accurate shop status — CDI workload, T&R completion rate, COMSEC account state, and any CDI program quality issues — without the Maintenance Officer having to ask.
    The production meeting brief is a 90-second shop status update: current CDI capability (how many CDIs, which platforms, any lapsed authorizations), open maintenance event workload by section, T&R completion rate against the NAVMC 3500.14 cycle, and COMSEC account status. Build a one-page shop status card from GCSS-MC data the night before the production meeting — not from memory. The Maintenance Officer who can plan the week's maintenance schedule around an accurate shop status brief is the Maintenance Officer who trusts the shop chief. The Maintenance Officer who discovers a CDI program gap from the QA representative's report rather than from the shop chief's production meeting brief is the Maintenance Officer who requires more frequent check-ins from that shop. Control the information flow. Brief the issue before the Maintenance Officer asks.
  4. 04
    Write Section A FitRep input on Sgt section chiefs that differentiates their performance by observable, specific, maintenance-context evidence — so the Maintenance Officer can place relative value without needing to revise the Section A.
    Section A for a Sgt section chief is a different writing task than Section A for a Cpl bench tech. You are describing the section's production outcomes — CDI sign-off volume, T&R completion rate, COMSEC account audit results, Cpl promotion outcomes — attributed to that Sgt's leadership decisions. Collect the raw material throughout the year: which aircraft tail numbers did the Sgt's section produce the most complex fault closures on, what was the section's CDI documentation error rate in the QA sample, how many Cpls did the Sgt develop into CDI qualification during the rating period. Draft the Section A 30 days before the FitRep cycle closes, not the week it is due. Run the draft through the Maintenance Officer informally before the formal submission — a reporting senior who has seen the draft and flagged language issues in advance produces a cleaner formal FitRep than one who revises the Section A cold on submission day. The SSgt whose Section A inputs consistently survive the MALS FitRep board review without revision is the SSgt who makes the Maintenance Officer's job easier and his own GySgt board narrative cleaner.
  5. 05
    Identify and develop GySgt-trajectory Sgts — composite score gaps, COMSEC account readiness, CDI program depth, FitRep profile management — 12 months before the SNCO board window.
    Monthly counseling with each Sgt section chief is the baseline. For each Sgt, know the current SSgt board competitiveness picture: FitRep relative value trend across the last two cycles, Sergeants Course completion status, MCMAP belt, COMSEC account management experience, CDI program authority scope. Identify the highest-leverage gap 12 months before the SSgt board window — if it is FitRep profile, work the Section A narrative strategy with the Maintenance Officer; if it is Sergeants Course PME, get the slot on the training calendar before the MALS surge consumes the window; if it is COMSEC account experience, create the sub-custodian rotation that builds the documented experience. The SSgt shop chief who can tell the Maintenance Officer the SSgt candidacy status of each Sgt in the section — with a specific development plan for each — is the SSgt whose FitRep narrative the GySgt board reads as a force developer, not just a maintenance producer.
  6. 06
    Participate in and brief at MALS production meetings and maintenance reviews as the shop's technical authority — aircraft configuration tracking, CDI program status, COMSEC account readiness, T&R completion — without the Maintenance Officer having to prompt the brief.
    The MALS production meeting is the SSgt's primary visibility event. You are not reporting to the meeting — you are briefing the shop's status and fielding the Maintenance Officer's questions about CDI workload, T&R completion, and COMSEC account currency. Prepare for it the way you prepared for a Sgt's section AAR: know the facts before you walk in, anticipate the Maintenance Officer's questions from the data, have a corrective action plan for any gap you are surfacing. The SSgt who walks into the production meeting having already identified the issue, already briefed the Sgt whose section has the problem, and already scheduled the corrective training event is the SSgt whose section the Maintenance Officer uses as the benchmark for the shop. The one who surfaces problems at the production meeting without a plan is the one who generates follow-up work for herself.

Manuals & References — What Chapters Matter

  • NAVMC 3500.14 — Marine Aviation T&R Manual (SSgt/shop chief collective tasks and training cycle)
    The shop-chief collective task list is in this manual. At SSgt you are managing the section's training cycle against the T&R schedule, not completing your own individual tasks. Print the shop-chief collective task list, walk it with the Maintenance Officer in the first 30 days of the SSgt billet, and build the section's training calendar from it. The QA representative who evaluates the shop during a MALS inspection is reading the same collective task list. Know which collective tasks require an external evaluator, which ones can be generated through production events with the right GCSS-MC documentation, and which ones require a dedicated training event separate from the production schedule.
  • MCO P4790.2C — Aviation Maintenance Management Program
    CDI program management authority, shop chief responsibilities, and the relationship between the shop chief and the Maintenance Officer are all in this manual. At SSgt the relevant chapters are the CDI program management chapter (authorizing, reviewing, and lapsing CDI qualification), the QA division sampling chapter (what the QA representative looks for when auditing CDI sign-offs at the shop level), and the maintenance review chapter (what the Maintenance Officer briefs to the squadron CO and what your shop status brief needs to provide). The SSgt who owns MCO P4790.2C at the chapter level can answer the Maintenance Officer's program questions before the QA representative asks them.
  • MCO 5530.14 — COMSEC Physical Security Program
    The primary account custodian chapter is the SSgt's operational reference, not the sub-custodian chapter you owned at Sgt. Primary custodian responsibilities include the full account management scope: semi-annual audit requirements, key inventory frequency, fill device transfer and destruction procedures, and incident reporting timelines and format. Verify the current revision of MCO 5530.14 on Marines.mil before the first audit cycle as primary custodian — policy updates occur and the custodian who is working from a prior revision is a custodian who may be running procedures that do not meet the current requirement. The Communications Security Officer checks the revision your account package cites.
  • MCO P5530.14 and applicable MALS COMSEC account procedures — unit COMSEC standard operating procedures (SOP)
    Every MALS has a unit-level COMSEC SOP that specifies the account management procedures, the TPI roster qualifications, the emergency destruction procedure, and the incident reporting chain for that unit. Read the unit SOP on your first day as primary custodian and verify that it is current — unit SOPs drift from the MCO P5530.14 parent document over time, and the custodian who is executing a procedure the unit SOP specifies that conflicts with the current MCO is the custodian who has a problem at the next Communications Officer inspection. If the unit SOP needs updating, that is your job to surface to the Communications Security Officer before the inspection finds it.
  • MCO 1610.7 — Performance Evaluation System (reporting senior responsibilities at SSgt level)
    At SSgt you are a reporting senior — the Section A input you write for Sgt section chiefs feeds directly into the formal FitRep the Maintenance Officer builds and submits. Read the reporting senior responsibilities chapter in MCO 1610.7: what Section A is supposed to describe, what 'relative value' placement means at the shop level (comparing Sgts against each other), and what the reviewing officer — the Maintenance Officer or the shop officer — expects the reporting senior's Section A to have accomplished before the formal FitRep enters the review process. Verify the current revision on Marines.mil before the first FitRep cycle. Revisions to the FitRep policy affect the attribute definitions and the Section A narrative format; an SSgt who is writing Section A input based on a superseded revision is writing to a standard that does not match what the reviewing officer is evaluating.
  • MCO 1400.32 — Marine Corps Promotion Manual (GySgt board mechanics and SNCO career timeline)
    The GySgt selection board mechanics are in this manual. Read the SNCO board section carefully: what the board reads, how FitRep relative value across multiple SSgt cycles is assessed, what PME completion is required (Gunnery Sergeant Course), and what the profile of a competitive GySgt candidate looks like in the communications avionics occfield. Pull the current MARADMIN for the GySgt board cycle and the current GySgt selection rate for 5939 before sitting with the Maintenance Officer about your GySgt timeline. The SSgt who understands the GySgt board mechanics is building her FitRep profile and NATTC instructor billet timing deliberately — not hoping the good cycles accumulate.
  • MCO 1000.9 — Marine Corps Reenlistment Program (career planner guidance and SRB)
    SRB amounts and reenlistment contract options for 5939 SSgts are governed by current MARADMIN messages, not the base MCO, but the MCO structures the entitlement framework the career planner uses. Pull the current MARADMIN for 5939 SSgt SRB rates and reenlistment options before the career planner conversation. SkillBridge eligibility, indefinite reenlistment to compete for GySgt, and station-of-choice options all flow through this framework. The SSgt who shows up to the career planner with the current MARADMIN in hand and a specific billet preference has a shorter and more productive conversation.

Standards — How to Hit Each

  • Gunnery Sergeant Course graduate — required PME gate for SSgt; baseline for GySgt board competitiveness.
    Schedule Gunnery Sergeant Course in-residence through the Maintenance Officer 90 days before the course drop date. The same logic that applied to Sergeants Course applies here: in-residence is the standard; distance education is the MEU-deployment fallback and is documented as a forced choice, not a preference. The GySgt board reads PME completion, and the SSgt who arrives at the board window without Gunnery Sergeant Course complete is visible in the relative value comparison regardless of FitRep quality. If the MALS maintenance surge or a deployment cycle consumes the slot, brief the Maintenance Officer on the conflict and build the recovery timeline for the next available drop — that conversation happens the day you identify the conflict, not the week the course starts.
  • COMSEC account audit cycle completed within 30 days of the scheduled date, self-reported in writing to the Communications Security Officer before the Communications Officer's review.
    Build the audit due date into the shop calendar 60 days out. Run the self-audit against the MCO 5530.14 audit checklist — every fill device serial number reconciled, every TPI log entry reviewed for completeness, every destruction record signed and filed, every transfer document in the account package. Complete the self-audit 30 days before the due date so any discrepancy discovered has time for corrective action before the formal audit. Submit the completed audit package to the Communications Security Officer in writing before the due date — not at the due date, before it. The custodian who delivers the audit package three days before the due date is the custodian who is managing the account; the one who scrambles to submit on the deadline is the one whose account records the Communications Security Officer reads more carefully.
  • 1st-Class PFT and CFT; section average maintained; Black Belt MCMAP standard.
    At SSgt, fitness is the section's cultural floor, not a personal standard. The shop whose SSgt scores 1st-Class on every test sets a different expectation for the Sgt section chiefs than the shop whose SSgt has trending toward 2nd-Class scores across cycles. Black Belt MCMAP is the SSgt standard the GySgt board reads as evidence of sustained martial arts commitment — not just minimum compliance. Build the Black Belt timeline before the GySgt board window; the MCMAP instructor at the MALS can schedule the technique demonstration and sustainment-hours verification. The SSgt who has Black Belt before the GySgt board window is the SSgt whose composite profile reads cleanly against peers who have Brown Belt and intend to get Black Belt.
  • CDI program management — every active CDI in the section with a current training jacket, annual review on schedule, systems scope accurate for the platforms being signed off.
    Build a CDI program tracking calendar for each CDI in the section: qualification date, systems scope, last annual review date, next annual review due date. Check the calendar monthly — not quarterly, monthly — because a CDI whose annual review lapses by 30 days is technically unauthorized until the review is completed, and a CDI whose review has lapsed while signing off production work has generated a maintenance program violation for every sign-off since the lapse date. Identify the lapse before the QA representative does. When an annual review is due, schedule it with the Maintenance Officer two weeks before the due date rather than the week of. The shop chief whose CDI program records are current before every QA visit is the shop chief whose program gets a clean sample result.
  • Section T&R event completion rate above 90% per NAVMC 3500.14 cycle, with each completed event entered in GCSS-MC the day it occurs.
    Build the section's T&R event calendar at the beginning of the training cycle. Assign each Sgt section chief ownership of the T&R events for their section — not just awareness of them. Brief T&R completion rates at the weekly production meeting. When an event is going to be missed due to flight surge or operational tasking, the make-up event is on the calendar before the original event date passes, and the Maintenance Officer knows about the gap and the recovery plan before the QA representative's sample. The shop chief who can tell the Maintenance Officer, at any production meeting, exactly how many T&R events are outstanding and when the make-up events are scheduled demonstrates that the section's training calendar is being actively managed. The GCSS-MC database is the single source of truth for the Maintenance Officer's readiness brief — a T&R event completed but not entered in GCSS-MC does not exist in that brief.

Technical Mistakes — Concrete Consequences

  • Allowing a CDI annual review to lapse without catching it before the QA representative's sample.
    A CDI whose annual review has lapsed is technically unauthorized — every sign-off produced after the lapse date is a maintenance program violation under MCO P4790.2C. The QA representative's semi-annual sample checks CDI authorization currency against the training jacket. A lapsed CDI discovered in a sample report goes to the Maintenance Officer as a quality finding; the Maintenance Officer briefs it to the squadron CO at the maintenance review. The SSgt shop chief whose CDI program produced a lapsed authorization is the SSgt whose program requires remediation under Maintenance Officer oversight. Catch it on the monthly CDI program calendar check, not in the QA sample.
  • Submitting Section A FitRep input on Sgt section chiefs in general terms — 'outstanding NCO,' 'exceptional leader' — without the specific, observable performance data the Maintenance Officer needs to differentiate relative value.
    The Maintenance Officer cannot assign differentiated relative value marks at the MALS FitRep board without specific performance data in the Section A. When three Sgts' Section A inputs read identically in tone and specificity, the relative value placement defaults to average marks across all three, regardless of actual performance differences. The Sgt who performed at the top of the section but whose Section A input was no more specific than the Sgt who performed at the bottom of the section gets an average mark. The SSgt whose Section A inputs consistently fail to differentiate her Sgts is the SSgt whose section produces GySgt-board-uncompetitive FitRep profiles — and the SSgt whose own FitRep narrative reflects that she failed to develop her Sgts' board-competitive profiles.
  • Briefing the Maintenance Officer about a CDI program quality problem or COMSEC account irregularity at the production meeting without a corrective action plan already in hand.
    The Maintenance Officer's production meeting is a status brief, not a problem-discovery forum. An SSgt who surfaces a quality issue at the production meeting without a corrective action plan forces the Maintenance Officer to generate the solution in the meeting — in front of the shop's leadership. The next week, the Maintenance Officer will ask for a status update on the corrective action, and if the SSgt does not have one, the frequency of Maintenance Officer oversight of the shop increases. The SSgt who surfaces every issue with 'here is the problem, here is my corrective action, here is the completion timeline' keeps the Maintenance Officer's confidence and keeps the production meeting the right length.
  • Failing to self-report a COMSEC account irregularity because it appears minor and the next audit is months away.
    There is no minor COMSEC account irregularity at the primary custodian level. An incomplete TPI log entry, a fill device serial number that does not reconcile, a destruction record that is missing the second signature — each of these is a self-reportable irregularity under MCO 5530.14. The Communications Officer's spot-check may happen tomorrow or may happen in four months. When the spot-check finds the irregularity, the narrative in the COMSEC incident report is 'found by inspector' rather than 'self-reported by custodian.' The CO hears both narratives; they are not the same narrative. The custodian who self-reports promptly and presents a corrective action has a conversation; the custodian who had an irregularity sitting for three months until the inspector found it has a different kind of conversation.
  • Leaving a Sgt section chief's development gaps unaddressed until the SSgt board window is already open.
    The SSgt SNCO selection board runs on the FitRep profile the Sgt has built over the entire Sgt window — not just the most recent cycle. A Sgt whose Sergeants Course PME slot was consumed by a MALS surge in the second year of the Sgt billet, whose COMSEC sub-custodian experience was never developed because the SSgt kept running the sub-custodian account personally, and whose FitRep Section A narratives from year one and year two were general rather than specific — that Sgt's board-competitive profile cannot be rebuilt in the 90 days before the board convenes. The SSgt shop chief who identifies development gaps at the 12-month mark and builds a specific plan to close them is the SSgt who produces competitive Sgts at the board. The one who notices the gaps when the SNCO board MARADMIN publishes is the one who writes a good Section A for a Sgt who is going to sit the board under-profiled.

Career Decisions at This Rank

  • NATTC Pensacola instructor billet timing — when in the SSgt window to pursue it and whether it serves the GySgt board profile
    NATTC Pensacola runs the 5939 technical pipeline continuously, and the school periodically fills instructor billets from the MALS fleet — experienced SSgts with demonstrated CDI program management experience and COMSEC account custodian history. An instructor tour is 2-to-3 years in which you shape the technical foundation of every 5939 Marine entering the fleet. The FitRep profile for an instructor tour includes a different set of observable behaviors than the MALS production tour — you are writing about curriculum development, student performance outcomes, and pipeline throughput rather than aircraft FMC rates and CDI sign-off volumes. Both tell a GySgt-board-competitive story; the instructor tour identifier carries weight at the GySgt board that a second MALS production tour does not replicate in the same way. The timing question: an instructor tour in the middle of the SSgt window keeps PME current (Gunnery Sergeant Course can often be completed during a Pensacola tour) while building the instructor-track identifier. Talk to the Maintenance Officer and the career planner about billet availability and timing before the GySgt window narrows.
  • GySgt board timing and FitRep profile management — how many SSgt FitRep cycles to build before the board is competitive
    The GySgt SNCO selection board is a centralized board that reads the entire SSgt FitRep record — not just the most recent cycle. The SSgt board competitiveness picture is built from the FitRep relative value trend across multiple cycles, PME completion (Gunnery Sergeant Course), CDI program management record, COMSEC account custodian history, and the overall SNCO profile the Maintenance Officer and the reviewing officer have constructed over the SSgt billet. Pull the current MARADMIN for 5939 GySgt selection rates before sitting with the Maintenance Officer about the GySgt timeline. The SSgt who understands the board mechanics — what the board reads, how relative value is assessed across multiple cycles, what the competitive profile looks like for 5939 — is building the profile deliberately. The one who hopes the good cycles accumulate is not.
  • Defense contractor pipeline — SkillBridge timing with L3Harris, Raytheon, or Collins Aerospace versus re-enlistment to compete for GySgt
    The defense contractor market for experienced 5939 SSgts is real. L3Harris, Raytheon Technologies (now RTX), and Collins Aerospace hire field service representatives, depot maintenance technicians, and systems integration specialists from the Marine Corps SSgt and GySgt ranks at compensation that significantly exceeds the pay grades you leave. The 5939 SSgt with eight to ten years of MALS production experience, primary COMSEC account custodian history, CDI program management across multiple aircraft platforms, and documented fault-isolation experience on F/A-18, F-35B, MV-22, or CH-53 systems is a competitive applicant. SkillBridge is available at 180 days before EAS and allows a full-time contractor internship while still drawing military pay. The honest analysis: a GySgt who serves 20 years and retires has a pension plus a second career in the contractor market; the SSgt who EASes at 10 years and goes directly to the contractor market has higher immediate compensation but no pension and no VA health care until age 60 (or earlier via disability). Run the numbers before the career planner conversation. Both paths are legitimate; the one you regret is the one you chose without doing the math.
  • B-billet pipeline at SSgt — DI duty at MCRD as a positive GySgt board marker versus continued MALS production through the GySgt window
    Drill Instructor duty at MCRD Parris Island or San Diego at SSgt is roughly a 3-year tour. The DI tour identifier is a known positive marker at the GySgt board — many GySgts and SgtMajs came up through DI duty as SSgts, and the leadership-under-pressure evidence a DI tour provides tells a board-competitive story that a MALS production tour alone does not replicate. The cost: a DI tour interrupts the MALS CDI program management and COMSEC account custodian experience that makes the 5939 SSgt technically distinctive, and the MCRD family quality-of-life environment is demanding in ways that matter if you have dependents. The SSgt who has two or three strong MALS FitRep cycles and a Gunnery Sergeant Course PME slot already scheduled is in a position to evaluate the DI tour with a full picture. The SSgt who is pursuing DI duty as an escape from a hard MALS shop is not thinking about this correctly — the DI school at MCRD is harder than the MALS shop.
  • Reenlistment options at SSgt — indefinite to compete for GySgt, station-of-choice, or lateral move to a broader avionics or communications field
    SRB amounts for 5939 SSgts at reenlistment are in current MARADMIN messages — pull them before the career planner conversation. Indefinite reenlistment to compete for GySgt is the standard path for SSgts with a clean FitRep record, Gunnery Sergeant Course complete, and a strong CDI and COMSEC account management history. Station-of-choice for the next MALS billet may be available depending on billet landscape — factor family quality-of-life and career-development opportunity together, not separately. The lateral move into a broader communications avionics or avionics systems integration field is an option some SSgts explore; the honest question is whether the receiving occfield offers a materially better GySgt board story or a better post-service market, and that answer is not obvious. Talk to a GySgt who has seen both sides of that conversation before submitting a lateral move request.

How the Seat Varies by Unit Type

  • Active component MALS — 1st/2nd/3rd MAW
    The primary SSgt 5939 billet. MALS communications avionics shop chief or senior CDI authority managing a section of eight to twelve Marines across F/A-18, F-35B, MV-22, CH-53, and rotary wing platforms depending on the MAW's aircraft composition. The shop chief's peer group is the other MALS shop chiefs; FitRep relative value placement reflects that comparison at the MALS level. CDI program management at a MALS operates across multiple aircraft platform families — the SSgt who knows the MIM fault-isolation logic for three or four platform families is the SSgt whose CDI authorization scope the Maintenance Officer cites at the squadron maintenance review. The QA representative's semi-annual sample is the primary external quality check; the COMSEC account audit is the Communications Officer's primary external check. Both land in the same place: the SSgt shop chief's name and program record.
  • Forward deployed to 1st MAW — MCAS Iwakuni or Okinawa installations
    MALS communications avionics shop chief in the forward-deployed Pacific theater. Unaccompanied tour policy varies by installation and rank — verify current policy with the Maintenance Officer before PCS orders are cut. The Indo-Pacific operational tempo supports III MEF and INDOPACOM contingency posture; exercises with JMSDF, Royal Australian Air Force, and ROK Marine Corps partners generate maintenance event loads and COMSEC coordination requirements that differ from CONUS. The forward-deployed COMSEC environment operates at a higher inspection frequency — the Communications Officer's spot-checks are more frequent than at CONUS installations because the operational stakes of an account irregularity in the forward-deployed environment are higher. The SSgt shop chief who runs a clean COMSEC account through a 12-to-18-month forward-deployed tour comes back with a FitRep Section A and a COMSEC custodian record the GySgt board reads differently.
  • MEU ACE — MALS detachment afloat on ARG shipping
    MALS detachment shop chief aboard amphibious shipping with the MEU Aviation Combat Element. Compressed maintenance space, limited tooling, constrained parts resupply, and an operational tempo that runs at MEU-SOC contingency pace. COMSEC account management aboard ship operates under the same MCO 5530.14 requirements as ashore; the ship's OPSEC officer and the ACE Maintenance Officer are both in the COMSEC incident reporting chain. Fill device transfer and destruction events at sea require the same same-day documentation as at home station. The MEU SgtMaj is watching shop chief performance across every maintenance event and every liberty evolution in port. The SSgt who runs a clean MEU deployment as shop chief comes back with a FitRep narrative the GySgt board reads as evidence of sustained leadership under operational pressure — a materially different narrative than a second CONUS MALS production cycle.
  • NATTC Pensacola instructor billet
    Aviation electronics instructor at Naval Air Technical Training Command Pensacola. You are teaching 5939 students the fault-isolation logic, COMSEC procedures, CDI documentation standards, and GCSS-MC annotation discipline that the MALS fleet expects to see when they arrive at their first duty station. The instructor billet produces a FitRep profile that emphasizes curriculum development, student performance outcomes, and pipeline throughput rather than aircraft FMC rates. The student evaluation and failure-to-progress documentation that the NATTC instructor manages is analogous to the FitRep Section A discipline the shop chief manages in the MALS — specific, observable, performance-based. An NATTC instructor tour on the SSgt record tells the GySgt board a story about force development investment that a second MALS production tour does not tell in the same way.
  • Reserve component MALS or squadron — weekend drill
    Reserve 5939 SSgt shop chiefs face a compressed management and evaluation timeline. Monthly drill weekends plus annual training provide the touchpoints for CDI program reviews, COMSEC account audit cycles, FitRep cycles, and T&R event completion. The total annual hands-on hours in a reserve component shop are a fraction of the active-component equivalent. The GySgt SNCO selection board processes reserve and active component records through the same centralized mechanism; the FitRep relative value comparison at the board includes both. Reserve SSgts who are serious about GySgt board competitiveness may pursue ADT orders to supplement the CDI program management event frequency and COMSEC account management experience during annual training cycles. The reserve shop chief who manages the account and the program with the same discipline during a two-week AT that the active-component SSgt maintains across a 12-month MALS tour is the reserve SSgt the Maintenance Officer cites at the AT debrief.

What Good Looks Like at This Rank

The good 5939 SSgt shop chief is the SSgt the Maintenance Officer does not have to manage. Not because nothing goes wrong in her shop — things go wrong in every shop — but because when something goes wrong, the Maintenance Officer hears about it from the SSgt, with a corrective action plan, before the QA representative's sample report or the Communications Officer's spot-check surfaces it. The Maintenance Officer's weekly production meeting brief from this SSgt is 90 seconds of accurate information. The QA representative's semi-annual sample of this shop produces one or two minor documentation coaching events, not a CDI program finding. The Communications Security Officer's COMSEC account audit of this SSgt's account is a morning's work, not a three-day reconstruction. Her Sgt section chiefs are building SSgt board-competitive profiles because she tracked their gaps 12 months before the SNCO board window and built specific development plans — Sergeants Course slot recovered after the MEU workup consumed the first window, COMSEC sub-custodian experience rotated among Sgts deliberately, Section A FitRep input coached to produce specific observable-behavior language rather than general endorsements. The MALS FitRep board reviews her Section A inputs and assigns differentiated relative value marks because the inputs actually differentiate — different aircraft platforms, different CDI sign-off volumes, different COMSEC account management outcomes. The Maintenance Officer does not revise her Section A inputs before the formal FitRep submission. The reviewing officer sees the differentiation and the board sees the profile. The COMSEC account is the shop's institutional reputation. Her account has been audited semi-annually for three SSgt cycles without a finding the Communications Security Officer did not already know about from her own self-reports. The key inventory reconciles before the audit date, not during it. The fill device transfer documentation is filed before the device leaves the section. The destruction records are signed within 24 hours. The Communications Officer's spot-check arrives at a time of the Communications Officer's choosing, not the SSgt's, and the account is in the same state on an unscheduled spot-check day as it is on the audit's scheduled date. That is the standard the primary custodian is held to. The SSgt who meets it consistently is the SSgt the Communications Security Officer recommends to the Maintenance Officer as the training reference for new sub-custodians across the shop.

Preview — The Next Rank

GySgt in the MALS communications avionics section is the section's senior enlisted technical authority — the maintenance chief, the CDI program authority, or the primary staff advisor to the Maintenance Officer on communications avionics production capability. The transition from SSgt shop chief to GySgt is the transition from managing a shop's CDI program to being the MALS's authoritative voice on what the CDI program should look like, from managing the COMSEC account to advising the Communications Security Officer on account management practices across the MALS, and from writing FitRep Section A on two to three Sgts to potentially writing Section A on three to four SSgts in a larger communications avionics department. The FitRep load at GySgt operates at the MALS level. The GySgt who is the MALS communications avionics department chief is writing Section A inputs on SSgts whose performance reflects the entire department's production quality — CDI documentation rates across the full shop, COMSEC account audit histories for multiple sections, T&R completion rates across platforms. Relative value placement at GySgt is comparing SSgts against each other at the MALS level, not the section level. The quality of that comparison is only as good as the Section A inputs, and the Section A inputs are only as specific as the observational data the GySgt has been collecting throughout the year. The SSgt who was writing specific, observable-behavior Section A on her Sgts is the GySgt who writes specific Section A on her SSgts. The habit carries forward. The 1stSgt conversation begins at GySgt — not as a certainty, but as a real decision point. The split between the technical SME track (MSgt, MALS maintenance chief, regimental communications systems specialist, NATTC curriculum developer) and the troop leadership track (1stSgt, eventually SgtMaj) begins to define itself in the GySgt billet. The GySgt who loves technical fault-isolation mentoring and curriculum development is building toward MSgt and the department-chief or schoolhouse track. The GySgt who keeps asking how the unit's administrative and welfare program is run and who volunteers to lead the unit fund committee and the family readiness group is signaling something different. The SgtMaj of the Marine Aircraft Group is already watching which GySgts in the MALS are building which kind of institutional contribution. Know which track you are on before the 1stSgt screen timeline makes the decision for you.
FAQ

5939 E6 — Frequently Asked Questions

Q01What does a E6 5939 (Aviation Communication Systems Technician) actually do?
You are the senior NCO in the communications avionics section of a MALS or a squadron avionics division — responsible for the training, evaluations, schools, promotions, and COMSEC accountability of a section whose work directly enables every communications-dependent aircraft sortie on the flight schedule.
Q02What's the most important thing to know as a E6 5939?
You are the primary COMSEC account custodian now — not the sub-custodian, not the backup.
Q03What does a typical day look like for a E6 5939?
Time-blocked day at the E6 5939 rank tier: 0500 Wake. Check the section group chat and the Maintenance Officer's overnight message log — any aircraft status changes, COMSEC safe access events, or personnel issues that affect the morning production meeting brief. PT uniform, head to the MALS, 0530 PT formation. Take shop accountability from the Sgt section chiefs and report to the Maintenance Officer or senior NCO. The SSgt who is the last NCO into formation is the SSgt the Maintenance Officer notes.…
Q04What mistakes get E6 5939 soldiers fired or relieved?
COMSEC account irregularity discovered by the Communications Officer's spot-check rather than self-reported by the custodian. At SSgt you are the primary account custodian of record. An account irregularity found by the Communications Officer goes to the CO in writing with your name as custodian. A self-reported irregularity with same-day notification and a documented corrective action is a different narrative — you still brief the CO, but you control the brief.…
Q05What career decisions matter most at the E6 5939 rank tier?
NATTC Pensacola instructor billet timing — when in the SSgt window to pursue it and whether it serves the GySgt board profile — NATTC Pensacola runs the 5939 technical pipeline continuously, and the school periodically fills instructor billets from the MALS fleet — experienced SSgts with demonstrated CDI program management experience and COMSEC account custodian history. An instructor tour is 2-to-3 years in which you shape the technical foundation of every 5939 Marine entering the fleet.…
Q06What's next after E6 for a 5939 (Aviation Communication Systems Technician) in the Marines?
GySgt in the MALS communications avionics section is the section's senior enlisted technical authority — the maintenance chief, the CDI program authority, or the primary staff advisor to the Maintenance Officer on communications avionics production capability.
Q07What manuals and regulations does a E6 5939 need to know cold?
NAVMC 3500.14 — Marine Aviation T&R Manual (section-level collective standards you build the training plan against).; MCO P4790.2C — Aviation Maintenance Management Program (section-chief authorities, QA division relationship, Maintenance Officer brief requirements).; MCO 5530.14 — COMSEC Physical Security Program (sub-custodian account management, audit requirements, and incident reporting chain you now own).

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