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1171E4

Water Support Technician

E-4 (Specialist/Corporal) · Marines

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

Corporal 1171 is the journeyman team leader — you own the water point from raw water intake to the last canteen fill. FitRep input starts here. The Sgt cutting score for 1171 is small-MOS volatile; track it monthly in TFRS. Corporals Course is the gate to Sgt.

The Honest MOS Read
Corporal in the 1171 community is the rank where the Marine Corps stops supervising your water and starts trusting it. The Cpl chevron means the section chief hands you a water support team — two to three Marines — and a mission: produce clean water, keep it clean, deliver it to the Marines who need it, and do not call me unless something breaks that you cannot fix. That trust is earned through the apprentice phase you just completed, and it is tested every time you set up a water point and sign the first test log. The daily work shifts from operator to operator-leader. In the field, you own the complete water point operation: site selection (proximity to raw water source, uphill from all contamination hazards, vehicle access for water buffalo resupply, defensible, far enough from the supported unit's operations to avoid contamination but close enough for practical resupply), TWPS setup and operation, water quality testing at intake, production, storage, and distribution, storage bladder chlorination, and the distribution schedule that keeps every unit in the supported area supplied. In garrison, you run the journeyman-level maintenance — membrane replacement, pump overhaul, chemical system calibration — and you supervise your apprentice Marines on the tasks you mastered at LCpl. The quality assurance accountability is the defining change at Cpl. You are no longer just running tests — you are the quality assurance authority for your water point. Every test your Marines run, you verify. Every log your Marines sign, you countersign. Every drop of water that leaves your water point for a Marine's canteen passed through your quality assurance review. The section chief spot-checks, but the daily quality assurance is yours. TB MED 577 compliance is your responsibility now, not just your skill. The administrative layer starts at Cpl: you write proficiency and conduct marks on your Marines, you track training records, you document counseling sessions. The FitRep input cycle under MCO 1610.7 begins — the section chief writes FitReps on you as a Cpl team leader, and the platoon commander reviews them. Your Pro/Con marks on your Marines feed their composite scores, which feeds their Cpl promotion timeline. The weight of the administrative work surprises most new Cpls — you are still a water support technician, but you are also a team leader who writes, documents, and counsels. The composite score math for Sgt under MCO P1400.32D: PFT/CFT scores, rifle qualification, awards, education credits (civilian coursework through Tuition Assistance, MCIs), Pro/Con marks averaged across reporting periods, MCMAP belt progression, and the MARADMIN cutting score for 1171 to Sgt. 1171 is a small MOS — the cutting score can move significantly between cycles. Track it monthly in the Total Force Retention System (TFRS) and know where you stand before the section chief asks. The coordination role expands at Cpl. Your TWPS needs generator power from the 1141 electrical section. Your water distribution feeds the supported unit's consumption rate, which the unit S4 manages. Your chemical supply comes through the platoon's logistics chain. The Cpl who coordinates these dependencies without being told is the Cpl the section chief stops micromanaging. The civilian certification window continues. State water treatment operator licensing programs accept military water purification experience hours in many states — the Cpl tour adds operational hours to the running total. Tuition Assistance covers the academic coursework. The Marine who uses the Cpl tour to advance the civilian licensing process walks out of the Corps with a stronger credential than the Marine who waits until EAS.
Career Arc
  • 01Cpl pin-on via composite score / cutting score under MCO P1400.32D.
  • 02Water support team leader assumption — two to three Marines, own water point.
  • 03Corporals Course PME completion — required, gated.
  • 04Journeyman-level T&R tasks completion in NAVMC 3500 (11xx).
  • 05FitRep input cycle under MCO 1610.7 — first experience as a rated Marine and a Marine who writes marks on others.
  • 06Composite score build toward Sgt cutting score for 1171.
  • 07Civilian water treatment operator certification advancement through Tuition Assistance.
Common Screwups
  • ×Treating the Cpl chevron as permission to delegate testing without verifying. You are the quality assurance authority — every test your Marines run, you verify. The section chief's trust in you is trust in the water your team produces.
  • ×Missing the Corporals Course slot. The Sgt cutting score requires Corporals Course completion; every cycle you miss the slot is a cycle you cannot compete.
  • ×NJP / DUI / fraternization — separation risk under MARCORSEPMAN, and in a small MOS the reputation damage is total and permanent.
  • ×Letting the composite score drift without tracking. 1171 is a small MOS with volatile cutting scores — the Cpl who does not know where he stands relative to the current cutting score is the Cpl who misses the Sgt promotion by points he could have earned.
  • ×Skipping the administrative work — Pro/Con marks, counseling documentation, training records — because you would rather be on the TWPS. The section chief reads your administrative discipline as your leadership discipline.

A Day in the Life

  • 0500Wake. Check the section group chat. Account for your Marines mentally — who is off, who is on duty, who had the liberty incident last weekend. PT gear on.
  • 0530PT formation. You report your team's accountability to the section chief. Missing Marine = your problem first.
  • 0545-0700Unit PT. You lead your team through the PT plan or fall in with the platoon for the platoon-led session. The Cpl sets the pace for his Marines.
  • 0700-0830Hygiene, chow, change into utilities. Pre-walk the motor pool bay before the section chief arrives. Your team's equipment should be staged and ready for the day's tasking.
  • 0830Morning formation. Section chief gives the day's tasking. You brief your team on their assignments — who is on maintenance, who is training, who is supporting a working party.
  • 0900-1130Morning work. TWPS/ROWPU maintenance — you run the PMCS with your Marines, supervise component work, troubleshoot faults. Or: T&R task training — you demonstrate a task, your apprentice Marine attempts it, you evaluate and document. Or: field prep — you run the PCC/PCI on the team's field equipment.
  • 1130-1300Chow. You eat with the section — the Cpl sits with the other Cpls and the section chief, not with the boots.
  • 1300-1500Afternoon work. Continuation of morning tasking. Pro/Con mark drafting if the reporting period is closing. Counseling sessions with your Marines — monthly at minimum, formal documentation when performance warrants it. Composite score review — pull the current cutting score for 1171 to Sgt.
  • 1500-1630Final formation. Platoon sergeant gives the next day's plan. You account for your team's tools, secure the work bay, and brief your Marines on tomorrow.
  • 1630Liberty call. Field problems and ranges break the schedule.
  • 1700-2000Personal time. Gym for a second session. Civilian coursework through Tuition Assistance — water treatment operator certification, environmental science. The Cpl who builds the civilian credential during service is the Cpl who has options at EAS.
  • 2000-2200If a Marine in your team has a problem — financial, personal, medical — you are the first call. The team leader who answers the phone and shows up is the team leader the section chief trusts with anything that matters.
  • Field problemYou run the water point. Sunrise startup, quality testing throughout the day, coordination with the electrical section and the supported unit S4, distribution management, shutdown at end of cycle. Your apprentice Marines rotate through the tasks under your supervision. The section chief checks your logs and your site layout — this is the evaluation that determines your next FitRep input.

Weekly Cadence

The Mon-Fri rhythm at Cpl shifts from receiving tasking to managing tasking. Monday you receive the week's plan from the section chief and translate it into daily assignments for your team — who is on which equipment, who is training on which T&R task, who is supporting a working party. Tuesday and Wednesday are the training and maintenance core — your team runs TWPS/ROWPU maintenance, practices water quality testing, and works through T&R task demonstrations and evaluations. Thursday is typically a platoon-level event or section maintenance wrap-up. Friday is accountability, weekly inventory, and the section chief's release. The administrative layer adds to the Cpl's week. Pro/Con marks for your Marines are due on the reporting schedule — monthly documentation of proficiency and conduct that feeds composite scores. Counseling sessions — developmental, not just corrective — run monthly at minimum. Training record updates documenting T&R task sign-offs. The Cpl who stays current on the administrative work spends 30 minutes a day on it; the Cpl who lets it pile up spends entire Fridays catching up. Field problems and the MEU PTP workup change the rhythm entirely. During a battalion FTX, your week is the water point — continuous operations from setup to teardown, with your team rotating through shifts. The ITX rotation at Twentynine Palms compresses the garrison rhythm into a training evaluation that runs 24 hours. The Cpl who runs a clean water point during an ITX rotation is the Cpl the section chief remembers when the Sgt cutting score drops.

Key Skills — How to Drill Each

  1. 01
    Select a water point site that satisfies tactical, sanitary, and logistical requirements — proximity to raw water, uphill from contamination, vehicle access, defensible.
    Walk the terrain with the map and the TB MED 577 site selection criteria in your head. The raw water source determines the site — but the contamination hazards determine the layout. Identify every latrine, fuel point, vehicle washdown area, and drainage path within 200 meters. The piping runs uphill from all of them. Vehicle access for water buffalo resupply determines the approach route. Defensibility matters in a tactical environment — the water point is a high-value target. Brief the site selection to the section chief before you set up; the section chief who has to move a water point after setup loses confidence in the Cpl who selected the site.
  2. 02
    Operate and maintain the TWPS/ROWPU through a complete cycle — startup, production, monitoring, backwash, chemical resupply, shutdown — and recover from a fault without losing the production schedule.
    The complete cycle from startup to shutdown is your responsibility now. The apprentice Marines assist; you run the system. Know the fault codes — the TWPS displays error conditions on the control panel, and the TM fault-isolation chapter tells you whether the fault is operator-correctable or requires maintenance support. The section chief expects you to troubleshoot and recover from operator-level faults without calling him. Practice the fault-isolation procedures during garrison maintenance — introduce faults deliberately (with the section chief's permission) and troubleshoot them under time pressure.
  3. 03
    Run a complete water quality testing cycle at all four sampling points — raw water intake, post-treatment, storage, and distribution — and make the go/no-go decision at each point.
    Four sampling points, four tests, four go/no-go decisions. Each decision is independent — the water can be clean at post-treatment and contaminated at distribution if the piping is compromised. Run the tests in order: intake first (to baseline the raw water quality), post-treatment second (to verify the TWPS is performing), storage third (to verify chlorination), distribution fourth (to verify the delivery system). Log every result. The section chief reads the log; the preventive medicine officer reads the log if there is an incident. The Cpl who runs all four points every cycle and documents accurately is the Cpl the section chief trusts.
  4. 04
    Run a PCC/PCI on your team's water purification equipment — testing kit calibration, chemical inventory, membrane condition, pump PMCS, bladder integrity.
    The PCC/PCI is not a form you fill out — it is the inspection that catches the expired testing reagent, the cracked membrane housing, the low chemical supply, and the bladder patch that is about to fail. Run it with your hands on the equipment, not your pen on the checklist. The section chief's PCI of your team starts with your PCC results — if the section chief finds something you missed, the section chief's confidence in your team drops.
  5. 05
    Coordinate with the 1141 electrical section on generator power for the TWPS and with the supported unit S4 on consumption rates and distribution schedules.
    The TWPS runs on generator power — the electrical section provides the generator, fuels it, and maintains it. Your job is to coordinate the power requirement (voltage, amperage, run time) with the electrical section chief before the field problem starts, not after the generator trips because you overloaded it. The supported unit S4 provides the troop density and consumption rate data that determines how much water you need to produce. Get both numbers before you brief the section chief on the water supply plan.
  6. 06
    Train and evaluate your apprentice Marines on individual T&R tasks — demonstrate, supervise, sign off — and document the training.
    Your apprentice Marines learn the MOS by watching you and then doing it under your supervision. Each T&R individual task in the NAVMC 3500 (11xx) has a performance standard. Demonstrate the task, let the Marine attempt it, evaluate against the standard, and sign off when the Marine can perform it correctly without prompting. Document every sign-off. The section chief tracks your Marines' T&R progress as a measure of your team leader effectiveness — the Cpl whose Marines complete T&R tasks on schedule is the Cpl the section chief promotes.

Manuals & References — What Chapters Matter

  • TB MED 577 — Sanitary Control and Surveillance of Field Water Supplies.
    You own this cover to cover at Cpl. The section chief will quiz you on the go/no-go criteria for every test parameter — not just the numbers, but why the numbers are set where they are. The Cpl who understands the rationale behind the chlorine residual range is the Cpl who makes the right decision when the reading is borderline.
  • Applicable TMs for TWPS and ROWPU systems.
    You own the fault-isolation and operator-level maintenance procedures now. The apprentice Marines come to you with the fault code; you open the TM, find the fault-isolation chapter, and walk the diagnostic procedure. The Cpl who can troubleshoot a TWPS fault in the field without calling the section chief is the Cpl the section chief puts on the hardest water point.
  • NAVMC 3500 (11xx series) — Utilities T&R Manual.
    The Cpl-level collective tasks are your evaluation standard. You are also responsible for signing off on your apprentice Marines' individual T&R tasks. Know both the collective tasks you are evaluated against and the individual tasks you evaluate your Marines against.
  • MCO 1610.7 — Performance Evaluation System.
    You write proficiency and conduct marks now. The Pro/Con marks you assign to your Marines feed their composite scores. The FitRep the section chief writes on you evaluates your leadership, not just your technical proficiency. Understand how the reporting system works — the marks, the narrative, the attribute rationale — because you are both subject and author now.
  • MCO 1400.32 — Marine Corps Promotion Manual.
    The composite score, cutting score, and board eligibility framework for the Sgt promotion. The Cpl who understands the cutting-score mechanics and tracks his composite monthly is the Cpl who pins Sgt on the first eligible cycle.
  • MCO P11000.12 — Facilities Maintenance Management.
    Covers the garrison maintenance work order system and the facilities maintenance framework your section operates within. At Cpl you interact with this through maintenance requests, work orders, and the motor pool procedures that govern your equipment maintenance cycle.

Standards — How to Hit Each

  • Green Belt MCMAP at minimum; Brown Belt is the bar you chase before Sergeants Course.
    MCMAP belt progression — Gray, Green, Brown, Black — is the visible signal of self-discipline the SNCOs read. Green Belt is the minimum at Cpl. Brown Belt before the Sergeants Course slot drops is what the section chief notes on the next FitRep. Schedule the Brown Belt tape with the platoon's senior MCMAP instructor and build the training hours into your weekly schedule.
  • Corporals Course graduate — required and gated; do not let the slot drop.
    Corporals Course is delivered at regional NCO academies — Camp Lejeune, Camp Pendleton, Camp Foster Okinawa — in-residence. The slot drops through the platoon sergeant; the Cpl who has expressed interest and has the composite score to back it gets the slot first. Do not wait for the section chief to offer — tell the section chief you want the slot and have your MCMAP, PFT, and rifle scores ready to justify it.
  • 1st-Class PFT and CFT — your Marines do not respect a team leader who falls out of a hump.
    At Cpl you are leading PT, not just doing PT. Your PFT and CFT scores are the standard your Marines measure themselves against. 1st-Class is the floor. The Cpl who humps at the front of the section with a 1st-Class CFT score sets the pace. The Cpl who falls out sets a different kind of example.
  • Water quality testing proficiency demonstrated at the journeyman level — accurate, repeatable, correctly documented every time.
    The section chief's quality assurance check on your water point is the evaluation that determines whether you run the next water point independently or under supervision. Every test result accurate. Every log entry complete. Every go/no-go call correct. The journeyman standard is not just getting the test right — it is getting the test right every time, under field conditions, under fatigue, under time pressure.
  • Composite score tracked monthly in TFRS — pull the current cutting score for 1171 to Sgt.
    The TFRS cutting score for 1171 to Sgt is published monthly via MARADMIN. Pull it before the section chief asks where you stand. Stack the composite score feeders — every MCMAP belt, every award packet submitted, every MCI or college credit earned, every PFT/CFT improvement. The small-MOS math means a few points can make the difference between pinning on the first eligible cycle and waiting.

Technical Mistakes — Concrete Consequences

  • Selecting a water point site downhill from a fuel point or latrine because it was closer to the raw water source.
    Contamination migrates downhill. The first rain event washes fuel or waste into your distribution piping. The Marines who filled canteens that morning are in sick call that afternoon. The TB MED 577 site selection criteria exist because this exact failure has caused waterborne illness in the field. The investigation names the Cpl who selected the site.
  • Skipping the mid-production water quality check because the startup test was clean.
    Raw water source conditions change — turbidity spikes after rain, chemical concentrations shift with temperature, upstream contamination events happen without warning. The water you distributed at 1400 may not meet the standard the 0600 test showed. The mid-production check catches the change before it reaches canteens. Skipping it means hours of contaminated water distributed to an unknown number of Marines.
  • Failing to record the chlorine residual at the distribution point, not just at the storage bladder.
    Chlorine residual decays in transit — in the piping, in the time between bladder and canteen. The water that was safe at the bladder may not be safe at the point where Marines fill their canteens. The distribution-point test catches the decay. The missing log entry means the investigation cannot confirm the water was safe at the point of consumption.
  • Letting your apprentice Marine run the chemical treatment without supervision.
    A chlorine dosing error — over or under — either sickens Marines or fails to protect them. The apprentice Marine is learning; learning without supervision on a life-safety procedure is reckless. Both outcomes end up in the command investigation, and the investigation asks why the team leader was not supervising the chemical treatment.
  • Running the TWPS on generator power without coordinating the load with the electrical section.
    The power surge when the TWPS pump starts can trip the generator breaker and shut down every other system on the distribution panel — lights, communications, medical equipment. The electrical section chief's read on the water support Cpl who blacked out the CP is not a read that recovers quickly.

Career Decisions at This Rank

  • Corporals Course in-residence versus non-resident through CDET.
    Corporals Course at a regional NCO academy in-residence is materially better than the CDET non-resident option — both for the rigor and for the network of Cpls you meet from across the Corps. The in-residence slot is the preferred option if the platoon sergeant can get it for you and the family or operational schedule supports it. CDET is the fallback that gets the PME checkbox completed when the slot timing does not work. The section chief and platoon sergeant make the recommendation; tell them you want the in-residence slot early.
  • Reenlistment at Cpl — stay 1171, reclass, or EAS with civilian credentials.
    The reenlistment decision at Cpl is the pivot point. SRB tier and bonus for 1171 are published in the current MARADMIN — pull it before the career planner conversation. The options: reenlist in 1171 and compete for Sgt, reclass into a sister 11xx MOS (1141 Electrician, 1161 Reefer Mechanic) if the civilian trade translation is a better fit, or EAS with whatever civilian water treatment operator certification you built during service. The honest math: the Marine who EASes at 4 years with a state water treatment operator license walks into a career. The Marine who EASes with nothing but DD-214 walks into a job search.
  • B-billet / lateral move window — DI duty, recruiter, MSG, instructor billet.
    B-billet options at Cpl are limited compared to Sgt, but DI duty at MCRD, recruiter school, Marine Security Guard (MSG) at Quantico, and instructor billets at MCES are available depending on MOS inventory and career planner guidance. Each B-billet is career-broadening and visible on the FitRep record. The cost: the B-billet tour takes you away from the 1171 operational community for 2-3 years. The benefit: the return to the fleet after a B-billet reads differently to the SNCO selection board. Talk to a senior NCO who has done the tour before you volunteer.
  • Civilian water treatment operator certification — timing and state selection.
    State water treatment operator licensing requirements vary by state. Some states accept military experience hours toward the licensure requirement; others require specific academic coursework. The Cpl tour is the window to research the target state's requirements, start the coursework through Tuition Assistance, and accumulate operational hours. The Marine who starts this at Cpl has 2-4 years to build the credential before EAS or reenlistment. The Marine who waits until the last 6 months of the enlistment has to rush the process and may not complete it before the DD-214 prints.

How the Seat Varies by Unit Type

  • Combat Engineer Battalion (CEB) — water support team in the utilities section
    The CEB assignment puts the Cpl water dog in the division's organic engineer support structure. The section chief is typically a Sgt or SSgt with deep 1171 experience. The water support team deploys as part of the CEB's engineer support package for the division's operations — MEU deployments, ITX rotations, battalion FTXs. The section is tight; the Cpl's team leader performance is visible to the platoon sergeant and company commander daily.
  • Combat Logistics Battalion (CLB) — utilities platoon water support team
    The CLB assignment places the Cpl in the MLG's logistics support structure. The utilities platoon may have more TWPS/ROWPU systems and a broader support mission than the CEB section. The CLB Cpl runs water support for multiple units during exercises, which means more complex consumption planning and distribution scheduling. The coordination with the supported units' S4 sections is more extensive.
  • III MEF forward-deployed (Okinawa / Hawaii)
    The III MEF rotation puts the Cpl in a forward-deployed environment with unfamiliar raw water sources. Water quality testing in Okinawa's tropical environment — high turbidity during monsoon season, different mineral content, different bacteriological baseline — tests the Cpl's testing proficiency in conditions that differ from CONUS training areas. Allied-forces exercises with Japanese, Korean, Filipino, and Australian units may include water support for partner forces.
  • MCES Camp Lejeune — schoolhouse support cadre
    A Cpl assigned to the MCES schoolhouse supports the instructor cadre and may serve as a student mentor for the 1171 course. The schoolhouse environment is more structured than the fleet, and the instructor cadre evaluates technical proficiency rigorously. The assignment reads well on the composite score and provides a deeper understanding of the MOS schoolhouse pipeline.

What Good Looks Like at This Rank

The good Cpl water dog is the team leader the section chief puts on the battalion water point without thinking. The TWPS runs clean, the testing logs are accurate, the distribution schedule holds, and the supported units never have to call and ask where the water is. His apprentice Marines are being trained — T&R tasks are being signed off on schedule, and the PFC who arrived last month can already run a Millipore test accurately under supervision. His testing kits are calibrated. His chemical supply is inventoried. His bladders are patched and serviceable. The PCC/PCI he runs on his team's equipment catches the failing pump bearing before it seizes during a field problem. The section chief does not have to ask about the chlorine residual because the log is posted at the water point with the time and the reading. The platoon sergeant has mentioned him for the next Sergeants Course slot because his Pro/Con marks are clean, his PFT is 1st-Class, his MCMAP progression is on track, and his team's water quality record is flawless. The company gunny knows his name because the utilities section's reputation in the battalion rests partly on the water support teams, and the team that never produces a water quality incident is the team the company gunny mentions to the battalion commander when the question about utility support reliability comes up.

Preview — The Next Rank

Sergeant (E-5) in the 1171 community is the section chief — two to three teams, six to ten Marines, and the platoon sergeant expects you to plan, resource, and execute the water supply plan for the supported command. The shift from Cpl to Sgt is the shift from owning a water point to owning the water supply program for a formation. You plan the water supply network for an entire base camp or area of operations: raw water source assessment, TWPS/ROWPU positioning, storage bladder placement, distribution piping routing, consumption rate estimates, and the resupply plan that keeps production ahead of demand. You write FitReps on your Cpls under MCO 1610.7 — not just Pro/Con marks, but the narrative input that drives the attribute marks and the relative value. You brief the supported unit commander on water availability, quality, and distribution schedule. When a TWPS fails, you execute the contingency plan and brief the platoon sergeant on the timeline to recovery. The Sergeants Course PME is the gate. The SSgt selection board reads FitReps, composite scores, PME completion, and the visible record of section-level leadership. The Sgt who runs a section where the water never stops flowing, the quality never wavers, and the supported commander never has to call and ask — that is the Sgt the SSgt board selects.
FAQ

1171 E4 — Frequently Asked Questions

Q01What does a E4 1171 (Water Support Technician) actually do?
You own a water support team — two to three Marines and yourself — and you are responsible for their training, their safety, and the water supply systems you are assigned.
Q02What's the most important thing to know as a E4 1171?
Corporal 1171 is the journeyman team leader — you own the water point from raw water intake to the last canteen fill.
Q03What does a typical day look like for a E4 1171?
Time-blocked day at the E4 1171 rank tier: 0500 Wake. Check the section group chat. Account for your Marines mentally — who is off, who is on duty, who had the liberty incident last weekend. PT gear on, 0530 PT formation. You report your team's accountability to the section chief. Missing Marine = your problem first, 0545-0700 Unit PT. You lead your team through the PT plan or fall in with the platoon for the platoon-led session. The Cpl sets the pace for his Marines, 0700-0830 Hygiene, chow, change into utilities. Pre-walk the motor pool bay before the section chief arrives.…
Q04What mistakes get E4 1171 soldiers fired or relieved?
Treating the Cpl chevron as permission to delegate testing without verifying. You are the quality assurance authority — every test your Marines run, you verify. The section chief's trust in you is trust in the water your team produces; Missing the Corporals Course slot. The Sgt cutting score requires Corporals Course completion; every cycle you miss the slot is a cycle you cannot compete; NJP / DUI / fraternization — separation risk under MARCORSEPMAN,…
Q05What career decisions matter most at the E4 1171 rank tier?
Corporals Course in-residence versus non-resident through CDET — Corporals Course at a regional NCO academy in-residence is materially better than the CDET non-resident option — both for the rigor and for the network of Cpls you meet from across the Corps. The in-residence slot is the preferred option if the platoon sergeant can get it for you and the family or operational schedule supports it. CDET is the fallback that gets the PME checkbox completed when the slot timing does not work. The section chief and platoon sergeant make the recommendation;…
Q06What's next after E4 for a 1171 (Water Support Technician) in the Marines?
Sergeant (E-5) in the 1171 community is the section chief — two to three teams, six to ten Marines, and the platoon sergeant expects you to plan, resource, and execute the water supply plan for the supported command.
Q07What manuals and regulations does a E4 1171 need to know cold?
TB MED 577 — Sanitary Control and Surveillance of Field Water Supplies (you own this cover to cover; the section chief will quiz you on the go/no-go criteria for every test parameter).; Applicable TMs for TWPS and ROWPU systems (you own the fault-isolation and maintenance procedures now).; NAVMC 3500 (11xx series) — Utilities T&R (the Cpl/Sgt collective tasks you are evaluated against).

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