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1120O1-O2

Submarine Warfare Officer

O-1 to O-2 (Junior Officer) · Navy

O1–O2O3–O4
HEADS UP

1120 Submarine Warfare Officer is the only Navy community where a flag officer personally interviews every candidate before accession. If you passed the Prospective Nuclear Officer interview with the Director of Naval Reactors, the community has already decided you can do the academic work. What the interview cannot tell either of you is whether you can earn the dolphins on a working boat inside a wardroom that will watch your every move for 24 months. The pin is the gate. Everything else — watches, division, FITREP — hangs on whether you make the board on time.

The Honest MOS Read
Submarine Warfare Officer at the ENS / LTJG level is built around a fixed pipeline that does not compress and does not offer shortcuts. You commission through USNA, NROTC, or OCS and survive the Prospective Nuclear Officer (PNO) interview with the Director of Naval Reactors — the only accession community in the Navy where the Admiral personally screens every candidate. After selection you report to Naval Nuclear Propulsion Training Command (NNPTC) at Goose Creek, South Carolina for Nuclear Power School (NPS): six months of graduate-level nuclear engineering academics covering reactor physics, thermodynamics, nuclear chemistry, electrical theory, and radiological controls. NPS is a serious academic load. The daily pace is demanding and the testing is frequent. Officers who treated the pre-commissioning nuclear interest as a career pathway rather than genuine aptitude find NPS expensive. After NPS, Naval Nuclear Power Training Unit (NPTU) at the same site runs another six months of hands-on reactor plant operation on an actual land-based naval reactor — watchstanding qualifications, casualty response under realistic conditions, and the practical translation of everything NPS taught. NPTU is where academic knowledge either converts into working competence or reveals that it did not. After NPTU, Submarine Officer Basic Course (SOBC) at Naval Station Groton, Connecticut: submarine tactics, weapons systems, doctrine, and the operational culture of the submarine force before your first boat. Your first submarine is an SSN (fast-attack) or an SSBN (ballistic missile submarine). NPC detailing drives the hull assignment. The specific boat matters more than you expect: the wardroom you join, the Commanding Officer's leadership culture, and the operational tempo of the command you report to will shape your qualification experience and your first FITREP in ways no assignment brief can fully describe. Report with an open mind and build relationships early. Aboard the boat you own a division from the first week — Weapons, Navigation, Sonar, Reactor, or a variant depending on the hull's organization. You have sailors, a chief, equipment, and a maintenance schedule. Your other job — the one the wardroom is actually tracking — is working the submarine qualification Personnel Qualification Standards (PQS) per OPNAVINST 1412.14 (or successor). Submarine warfare officer qualification requires you to demonstrate working knowledge of every major system aboard the submarine and pass a formal qualification board conducted by the XO and department heads. The board tests whether you actually learned the systems or whether you chased signatures without understanding what was behind them. The chiefs who endorsed your PQS cards know exactly which officers did the real work and which ones ran the easy path. The board will, in short order, reveal which kind of officer you were. The qualification timeline is not officially published as a hard deadline in the way that some communities communicate them, but the wardroom and the XO know roughly when an officer at each stage should be finishing. Dolphins earned early or on pace are invisible — as intended. Dolphins earned late are noticed. The pattern travels from the Chief of the Boat to the XO to the CO and eventually into the FITREP narrative. The watchstanding progression runs in parallel: Junior Officer of the Deck (JOOD) under instruction, then OOD underway as you accumulate bridge time and demonstrate ship-handling competence, and on nuclear submarines the reactor plant watchstanding qualification track runs alongside and cannot be separated from the OOD track. The OOD on a submerged nuclear submarine bears simultaneous responsibility for the safe operation of the ship and the nuclear propulsion plant. This dual accountability is baked into the submarine community's qualification architecture in a way that has no direct equivalent in the surface fleet. The SSBN assignment introduces a third layer: strategic nuclear weapons certification requirements under COMSUBLANT / COMSUBPAC guidance. These certifications are in addition to the submarine qualification and are not optional. The SSBN patrol cycle and the associated personnel reliability requirements shape the division officer's daily life in ways the pre-commission brief does not fully communicate. The Chief of the Boat is the most important professional relationship you will build at this tier. The COB runs the ship in ways the organization chart does not capture. He has been operating submarines since before you were commissioned. His read of which division officers are worth investing in travels to the XO and CO through a thousand small interactions. Build that relationship with humility and consistency, not with the intellectual confidence the nuclear pipeline selected you for. The pipeline vetted your brain. The COB is vetting your judgment.
Career Arc
  • 01Commission (USNA / NROTC / OCS) → PNO interview with Director of Naval Reactors — the accession gate unique to the nuclear community.
  • 02Nuclear Power School (NPS) at NNPTC Goose Creek SC, approximately six months of graduate-level nuclear engineering academics.
  • 03Naval Nuclear Power Training Unit (NPTU), approximately six months of hands-on reactor plant operation at a prototype site.
  • 04Submarine Officer Basic Course (SOBC), Naval Station Groton CT — submarine tactics, doctrine, weapons, and operational culture pre-fleet.
  • 05First submarine (SSN or SSBN via NPC detailing): division officer billet, submarine qualification PQS work, watch progression from JOOD to OOD.
  • 06Dolphins earned per OPNAVINST 1412.14 (or successor) — the qualification board and pin that ends the probationary window.
  • 07First FITREP relative ranking closed; NPC detailer conversation for post-first-tour assignment begins at approximately 18-24 months aboard.
Common Screwups
  • ×Missing the dolphin qualification timeline — dolphins earned late are a visible flag in the wardroom and the FITREP. The board does not fail officers who prepared; it exposes officers who chased signatures without learning the systems. Late dolphins signal the wrong thing to the CO writing the first FITREP.
  • ×DUI, NJP, or conduct violation during the pipeline or first sea tour. Career-terminal in the nuclear community where the Naval Reactors program holds officers to a documented standard of personal reliability. A conduct flag in a nuclear-propulsion officer's record is reviewed not only by NPC but by the Naval Reactors program itself.
  • ×Nuclear procedural deviation — departing from written procedure even once, even in training, even without visible consequence. The nuclear propulsion program's safety record exists because procedural compliance is non-negotiable policy. A documented deviation at ENS/LTJG is a flag that follows the officer for the rest of the submarine career.
  • ×Letting the division consume the qualification work. Division management is the visible daily job; the qualification PQS is the actual gate the wardroom tracks. The officers who let division administration crowd out PQS board prep discover the problem at the 15-month mark when peers have dolphins and they do not.
  • ×Posting anything connected to the boat's schedule, departure dates, port calls, equipment status, or operational activity on social media or in non-secure communications. Submarine OPSEC is not a formality — the operational advantage of the submarine force rests on ambiguity about location and schedule. A violation at the JO level is a CO-level event.

A Day in the Life

  • 0500Wake. On a nuclear submarine underway, the watch rotation defines the day — 0500 on port-and-starboard does not mean morning quarters, it means you are either going on watch, coming off watch, or in the three-hour window between. Check the 1MC (ship's general announcing system) log for any overnight engineering or tactical events that affect your division or your watch.
  • 0530PT — underway, the submarine's gym spaces are minimal and the schedule is compressed around the watch rotation. Officers maintain fitness in the window between watch relief and morning quarters. In port, PT runs with the division or independently on the pier. The division officer who skips PT when the division is running it has communicated something.
  • 0630Hygiene, uniform, breakfast in the wardroom. The wardroom meal is where the CO and XO form their impressions of the JO cohort between operational events. Do not eat in your stateroom. The conversations that shape FITREP narratives happen in the wardroom at meals.
  • 0700Division morning quarters in divisional spaces. The chief accounts for personnel, passes the plan of the day, and flags any administrative actions pending. You stand next to the chief, address any officer-level items, and synchronize the maintenance plan for the day with the LPO. This 15 minutes sets the day's work schedule.
  • 0730-0900PQS work — the primary deliverable of the first 18 months aboard. Interview sessions with the system-owning chiefs and petty officers are the load-bearing qualification activity. The chief who endorses the sonar system PQS card expects you to know the system's purpose, its operating parameters, its failure modes, and what happens to the watchteam when it degrades. Come to the interview with that knowledge already organized.
  • 0900Department head morning brief — you brief divisional readiness to the department head: personnel present-for-duty count, PQS pipeline status for each sailor in the division, outstanding CASDREP items by system, maintenance schedule compliance. This brief is yours. Do not bring the chief to answer for you. Know your numbers before you open your mouth.
  • 0930-1100Watch rotation underway (JOOD or OOD depending on qualification status) or divisional maintenance in port. Underway, this is the tactical watch period — submarine operations, contact management, navigation, and reactor plant status awareness. In port, this is the maintenance execution window: PMS items executed by petty officers under the LPO's direction, with the division officer available for officer-level coordination and administrative clearance.
  • 1100-1300Lunch in the wardroom. Post-lunch: FITREP support form drafting for the current reporting cycle, PQS board preparation (reviewing system knowledge against likely board questions), EVAL drafts on division sailors due for submission. If a CASDREP item is open and parts are pending, this is the window to coordinate with the Supply Officer on parts tracking.
  • 1300-1530Operational or training evolution — torpedo approach and attack drill, damage control drill, nuclear casualty drill, or underway replenishment coordination (for surface periods). The division has assigned stations for every evolution. The division officer's job during a general quarters drill is to manage divisional station assignments and report readiness to the department head. The XO debriefs every GQ drill; the division officer briefs divisional performance in the debrief.
  • 1530-1700Post-evolution maintenance and PMS documentation. Completed items logged, signed by responsible petty officer and division officer, rescheduled if deferred. CASDREP updates to the department head by 1600. End-of-day sensitive equipment accountability with the chief.
  • 1700-1900PQS board preparation — evening self-study against the qualification sections due for endorsement next week. FITREP support form work if the reporting period is closing. Dinner in the wardroom. On most submarine commands, wardroom dinner is a standing institution.
  • 1900-2100Quiet work period. Systems manual study against PQS sections in progress. OOD qualification log updating — every underway watch period documented with conning evolutions, contacts handled, and any notable events. EVAL drafts. NWP 3-21 series reading.
  • 2100-0500Watch rotation underway. The mid-watch (0000-0400) is where the division officer builds the OOD reputation — night operations, reduced-visibility conditions, and any contact situations that require judgment. The CO who observes a JO handle a challenging tactical situation at 0200 without calling the CO for a judgment call the standing orders already cover is the CO whose OOD endorsement conversation happens that week.
  • Port / In-port scheduleWatch rotation shifts to port duty officer rotation — duty sections stand watch while others are on liberty or admin leave. Administrative work front-loads: EVAL cycles, supply actions, equipment certifications, leave processing. The in-port period is also the PQS intensive period — more predictable scheduling allows longer system-study sessions and more interview time with chief petty officers who are not standing watch. Do not treat the in-port period as recovery; the XO's in-port plan is full and your column in it is real.

Weekly Cadence

Underway, the submarine week does not run on Monday-Friday rhythms — it runs on the watch rotation and the operational schedule. The 6-on/12-off or port-and-starboard watch cycle defines when you sleep, eat, and do divisional work. The planning anchor points that matter are the weekly operations meeting (which the XO or department heads lead), the weekly PMS review (maintenance plan compliance), and the CO's quarterly all-hands if the command runs one. Your divisional work lives in the white space between watch rotations, and on a working submarine in deployment there is less white space than the schedule implies. The officers who manage the qualification timeline successfully are the ones who do PQS study work in every available 30-minute window — after mid-watch, before evening quarters, during a quiet watch period — not the ones who wait for long blocks of free time that do not exist. In port, the week reverts to a garrison rhythm: Monday morning department head syncs, daily quarters, administrative processing windows, equipment maintenance evolutions, and division training periods. The in-port week is the window for PQS-intensive work — predictable scheduling, accessible chiefs, and a maintenance pace that allows longer study sessions than underway operations permit. The XO's in-port training schedule fills most of the day; the personal qualification work happens in the evenings and on the weekends before liberty. The administrative clock that matters most at the ENS/LTJG tier is the FITREP reporting period calendar and the dolphin qualification timeline. Build both onto a personal planning calendar from the first week aboard. The reporting period closes on a fixed date whether or not the deployment has been operationally intense. The support form that lands on the department head's desk the day it is due is the support form that gets the department head's full attention; the support form that lands a week early and prompts a conversation is the one that produces the best FITREP narrative. The division officer who manages the administrative calendar at the same precision level as the watch qualification timeline is the division officer whose career does not have avoidable administrative deficiencies.

Key Skills — How to Drill Each

  1. 01
    Complete Nuclear Power School and NPTU to NNPTC standard — demonstrate working mastery of nuclear reactor theory, thermodynamics, nuclear chemistry, and reactor plant operations before every subsequent qualification rests on that foundation.
    NPS is an academic sprint; the study discipline you build in the first two weeks either carries you through or exposes the gap by week eight. Build a structured daily study schedule from week one — not the night before each test. The material at NPS is real engineering, not survey-level content. NPTU translates the academics into physical competence: you are operating an actual reactor plant, standing actual watches, responding to simulated casualties under the watch of evaluators who are documenting your decisions. Treat every NPTU evolution as a real-conditions event, not as a training exercise where the consequence of a mistake is just a debrief. The officers who arrive at the first boat with strong NPTU performance have a foundation the boat's Engineering Officer of the Watch can build on; the officers who scraped through NPTU are rebuilding from the beginning on a working submarine.
  2. 02
    Work the submarine qualification PQS per OPNAVINST 1412.14 (or successor) — earn each watchstation endorsement by demonstrating genuine system knowledge to the chief or petty officer who owns that system, not by chasing signatures.
    The PQS book is long and the signatures come from every technical corner of the submarine. Start the qualification system-study from the first week aboard. Allocate after-hours reading time every day — not occasionally, every day — to the systems you need to interview next. The chief who owns the main ballast tank system does not need you to recite the manual; he needs to see that you understand the system's purpose, its normal evolution, and what happens if it fails. Come to the interview prepared to explain the system from first principles, not to read it back. The chief who sends a JO away twice for inadequate preparation knows the difference between an officer who is working and one who is not. The COB knows which chiefs are sending JOs away. Build a qualification board preparation binder from the first month aboard — every system, every emergency procedure, every qualification milestone — and practice answering board-quality questions on your own timeline before the formal board.
  3. 03
    Lead a submarine division — own PQS completion rates, write defensible EVALs, manage maintenance schedules and material readiness, and brief the department head on your spaces with numbers that are current and do not require a caveat.
    The division is yours from the first week. The LPO and the chief run the daily hands-on work; your job is to set the standards, clear administrative obstacles, write EVALs that accurately reflect performance, and know your numbers without being asked. Pull the current NAVPERS 1616 series and understand the EP percentage cap at your command before you type the first EVAL bullet. The chief who trusts your EVAL drafts does not rewrite them. The chief who does not trust your drafts runs the EVALs around you to the department head — and the department head notes which DOs' EVALs arrive via the chief's desk versus the division officer's. Weekly maintenance schedule review with the LPO is not optional. Know which items are complete, which are deferred, and which are in CASDREP status before the department head asks.
  4. 04
    Stand the progressive watch qualification track — from JOOD observer to OOD underway — demonstrating ship-handling competence and nuclear watchstanding proficiency simultaneously.
    The OOD track on a submarine runs parallel to the PQS qualification system and you cannot separate them. Build bridge time deliberately — volunteer for every available watch rotation, log every challenging evolution (deep-water track transits, approach and attack drills, man-overboard drills), and prepare for each watch relief as though the CO is watching, because eventually the CO is watching. The CO's unrestricted OOD endorsement is based on direct observation of the JO handling the watch correctly under pressure. It does not come from a checklist sign-off. It comes from the CO standing behind you during a situation that required judgment and deciding you handled it right. On a nuclear submarine, OOD competence is inseparable from reactor plant awareness — the OOD owns both. Know the plant status every time you relieve the watch.
  5. 05
    Submit an accurate, concrete FITREP support form to your department head rater every reporting period — document divisional accomplishments, qualification milestones, and watchstanding progression with specific outcomes the CO can quote directly.
    The support form you submit is the primary raw material for the FITREP narrative the department head writes. A vague support form produces a vague FITREP. Write the support form the way you would want someone to argue for your career in writing: specific qualification dates, divisional PQS completion rates expressed as a fraction, equipment CASDREP resolution timelines, watch qualification endorsements earned. Do not submit a list of duties — submit a document that demonstrates outcomes. The FITREP relative ranking is the department head's call, but the narrative is built on what you handed them. The officer who feeds the rater a clean, specific support form is the officer whose FITREP bullets can be read by an NPC board three years later without a translation layer.
  6. 06
    Execute SSBN-specific nuclear weapons certification requirements if assigned to a ballistic missile submarine — certifications that run parallel to the basic submarine qualification and carry additional readiness accountabilities.
    SSBN qualification requirements under COMSUBLANT / COMSUBPAC guidance add a certification track to the existing PQS workload. The personnel reliability program, the strategic nuclear weapons certification, and the additional watchstation requirements are not optional and do not defer to the basic qualification timeline. Build the SSBN certification track into your qualification calendar from the first week aboard an SSBN — it does not fit comfortably alongside the basic submarine qual if you start it late. The SSBN wardroom's qualification culture is shaped by the strategic mission; officers who do not internalize that context early stand out in the wrong way.

Manuals & References — What Chapters Matter

  • OPNAVINST 1412.14 (or successor) — Submarine Warfare Officer Qualification Program.
    The governing instruction defining pin requirements, the qualification board process, and the timeline expectations for the entire 1120 designator. Read this cover to cover in the first week aboard — it is the framework inside which the next 24 months of your submarine career operates. The PQS book is the physical manifestation of this instruction. The qualification board is its execution.
  • Nuclear Power School course materials and NPTU watchstation qualification standards — NNPTC, Goose Creek SC.
    The technical foundation every subsequent qualification rests on. If NPS material went stale in your memory during SOBC, fix that before the first reactor plant qualification board on the boat. The Engineering Officer of the Watch at your first command will ask questions that assume active retention of NPS material, not recollection of what was once studied. Keep the NPS notes.
  • NWP 3-21 series — Submarine Warfare publications.
    The operational doctrine framework SOBC built into your preparation and that your boat trains against. As a division officer you are expected to understand the tactical framework your watchstanding qualification is embedded in. The OOD board will ask questions that assume familiarity with the NWP 3-21 framework; treat it as a living reference, not a one-time read.
  • NAVPERS 1616 series — Officer Fitness Report (FITREP) and Enlisted Evaluation Report (EVALREP) instructions.
    You write EVALs on your enlisted division and receive FITREPs from your department head. Know both sides before the first reporting period closes. The EP percentage cap, the relative ranking mechanics, and the administrative procedures (report dates, closeout windows, routing) are in this document. The JO who has not read the instruction writes EVALs the chief has to fix.
  • MILPERSMAN 1000-series — Naval Military Personnel Manual, including the NJP articles (1600-series) and advancement eligibility (1430-series).
    You are responsible for the administrative welfare of your division's sailors from the day you report aboard. The NJP procedures, advancement eligibility requirements, and administrative separation articles are the ones you will need on short notice when something goes wrong in the division. Read the NJP articles before the first disciplinary event, not after.
  • Your submarine's Commanding Officer's Standing Orders and the Ship's Tactical Manual.
    The CO's Standing Orders are the CO's law, specific to this hull. Memorize them before the first watch rotation. They specify exactly when to call the CO, what maneuvering situations require the CO's presence, and what the watch team is authorized to decide independently. The OOD qualification board opens with a question about the Standing Orders. The OOD who reaches for the binder during the board has already told the board something.

Standards — How to Hit Each

  • Nuclear Power School graduate (NNPTC Goose Creek SC, approximately six months) — the academic gate; NPS academic standing is visible in your service record for the duration of the nuclear career.
    NPS academic performance is documented and tracked by the Naval Reactors program. The standard is not merely passing — it is demonstrating genuine comprehension of nuclear engineering principles that will be tested again at every reactor plant qualification and at every Naval Reactors inspection for the rest of the career. Do not coast through NPS on minimum performance; the material compounds, and the officer who barely passed thermodynamics is the officer rebuilding from scratch at the first EOOW qualification board.
  • NPTU complete — hands-on reactor plant qualification at a prototype site demonstrating that NPS academic material translates into practical reactor plant operation.
    NPTU is not an extension of NPS academics — it is the translation test. Build the NPTU watchstation qualifications at a pace that puts you at the watch qualification board ready, not hoping. The casualty response evolutions at NPTU are evaluated under realistic conditions; the evaluators are looking for officers who can execute under pressure without departing from procedure. Treat every NPTU evolution as an assessed event regardless of whether evaluators are visibly present.
  • Submarine Officer Basic Course (SOBC) graduate, Naval Station Groton CT.
    SOBC is the pre-fleet tactical and operational loading for the submarine community — treat the course materials as a working reference binder, not a one-time read. The submarine tactics, weapons employment framework, and operational culture introduced at SOBC are the intellectual context inside which every subsequent watchstanding qualification operates. Arrive at the first boat with the SOBC material still active, not archived.
  • Submarine Warfare Officer Insignia (dolphins) earned per OPNAVINST 1412.14 (or successor) within the wardroom's expected timeline — the qualification gate that ends the probationary period aboard the boat.
    There is no official published hard deadline in a public NAVADMIN, but every wardroom has an implicit timeline based on operational tempo and the CO's expectations. Build toward the board at a pace that puts you ready at the 15-month mark with buffer for deployment disruption. A failed board extends the timeline and documents the qualification effort for the CO. Prepare for the board the same way you prepared for NPTU — by actually knowing the systems, not by reviewing what you think the board will ask.
  • PRT pass (Good or better) and BCA in standard per OPNAVINST 6110.1 every reporting period.
    Submarines run independent command PRT cycles. The division watches whether the division officer meets the standard they are held to. A PRT failure at ENS/LTJG is recoverable once; a second failure within four years initiates administrative proceedings under OPNAVINST 6110.1. Maintain a training baseline regardless of the underway schedule — the operational tempo of the submarine force does not make physical readiness optional, and the officers who treat it that way are visible to the COB.

Technical Mistakes — Concrete Consequences

  • Chasing PQS signatures without genuine system knowledge behind each endorsement.
    The qualification board is conducted by the XO and department heads who know the submarine's systems and know how to follow a line of technical questioning until an answer breaks down. The officer who built the PQS book on signature-chasing will fail the board — and a failed board is documented, reported to the CO, and extends the dolphin timeline while flagging the qualification effort. The chiefs who endorsed the PQS cards are also aware that the board is testing whether the work was real.
  • Walking into a reactor plant qualification board or a watchstation endorsement board unprepared.
    On a nuclear submarine, watchstation boards are formal assessments with documented results that travel to the CO and to the Naval Reactors program's records. A failed watchstation board at the junior officer level is not a routine development event — it is a flag that the officer is not meeting the nuclear propulsion program's readiness standard. The CO's awareness changes after a failed board, and not in a direction that helps the FITREP narrative.
  • Running a division meeting without knowing the division's PQS completion status, outstanding CASDREP items, and maintenance schedule before the brief.
    The department head's morning sync is built on the assumption that each division officer has command of their spaces. 'I think most of them are on track' is not an answer — it is evidence that the division officer is not tracking the division. The department head who has to follow up on a brief with a second question because the DO did not know the answer is the department head whose FITREP narrative reflects it.
  • Departing from a written nuclear or tactical procedure, even once, even in a training evolution, even without visible consequence.
    On a nuclear-powered submarine, procedural compliance is not a judgment call. Departures from written procedure are investigated and documented regardless of outcome because the safety record of the naval nuclear propulsion program is built on a system that does not allow procedural deviations to accumulate without consequence. A documented deviation at ENS/LTJG is a flag the Naval Reactors program tracks independently of the NPC system. The CO is notified. The record follows the officer.
  • Posting any information about the boat — schedule, port calls, departure and return dates, equipment configuration, crew roster, or any operational detail — on social media or in non-secure communications.
    The submarine force's operational advantage depends on adversary uncertainty about submarine location, schedule, and employment. A single post that establishes the boat's schedule, departure date, or operating area gives adversary intelligence services a data point they will work against. An OPSEC violation at the division officer level triggers a CO-level investigation, an administrative record entry, and a flag the FITREP cannot conceal. The community remembers it.

Career Decisions at This Rank

  • Community transfer out of the submarine community — the window is narrow and closes fast.
    The window for community transfer out of the 1120 designator is effectively the first two years commissioned, before the ADSO tied to nuclear program training locks the officer in. After NPS and NPTU the service obligation incurred by nuclear training is real and documented; NPC detailing and the Naval Reactors program both track it. An officer who discovers after dolphins that the submarine force is not the right fit is in a fundamentally different situation than one who makes that assessment before the NPTU pipeline. If there is genuine interest in another community — surface warfare, aviation, information warfare — the time to have that conversation with NPC is before the nuclear pipeline, not after. After the first sea tour, the practical transfer options narrow significantly.
  • SSN versus SSBN first tour — what actually differs between the two.
    NPC detailing drives the first-tour assignment and officer preference is a real input but not a determinative one. SSN (fast-attack) tours are operationally varied — independent operations, intelligence collection, support to special operations forces, strike missions — and the watch qualification pace is typically faster because SSNs operate more independently. SSBN (ballistic missile submarine) tours have a specific operational rhythm built around the strategic deterrence patrol cycle and the associated personnel reliability requirements. The qualification work is the same fundamental submarine PQS; the SSBN adds the strategic nuclear certification layer. Neither hull type is a better first tour in a career sense. The officer should express a preference to the NPC detailer and be prepared to perform at the same level in either assignment. The wardroom and COB at the receiving boat matter more to the first-tour experience than the hull type.
  • Inter-tour billet selection after the first sea tour — what to do with the shore window.
    After the first sea tour, the next billet is typically a shore or staff assignment before the Submarine Officer Advanced Course (SOAC) nomination conversation. The FITREP from this inter-tour billet is one of the documents NPC reads when building the SOAC nomination list. The shore billet options include SUBLANT/SUBPAC staff, NAVSEA 08 (Naval Reactors), NPC submarine community detailing, COMSUBLANT/COMSUBPAC operational staff, and various joint billets. The billet that keeps the officer operationally visible — SUBLANT/SUBPAC operations staff, NAVSEA 08 technical staff — is generally the one that produces a more competitive FITREP than a low-visibility administrative billet. Express preference to the NPC detailer and ask specifically which billets have produced strong SOAC-nomination FITREPs in the most recent year-group cycles.
  • The retention signal at the first ADSO window — when is it actually time to think about it.
    The initial service obligation for nuclear-trained officers is documented in NPC guidance and Naval Reactors program agreements. The civilian nuclear industry — commercial power utilities, naval architecture firms, Department of Energy national laboratories — actively recruits officers with nuclear submarine propulsion experience and pays a premium for the combination of nuclear technical background and operational leadership. The decision to stay or leave at the first ADSO window is worth modeling seriously at the 18-month mark, before the urgency of the decision creates pressure. Pull the current NAVADMIN on submarine force retention incentives and bonus structures. The submarine community has historically used targeted retention bonuses to address specific year-group gaps; the current terms are in the active NAVADMIN, not in peer recollection of three-year-old bonus amounts. Make the decision with the current numbers on the table.

How the Seat Varies by Unit Type

  • SSN (fast-attack submarine — Los Angeles class, Virginia class)
    The SSN is where the majority of 1120 division officers spend their first tour. Fast-attack submarines operate independently across a wide mission set: intelligence collection, support to special operations forces, strike, anti-submarine warfare, and theater undersea surveillance. The operational tempo is varied and the watch qualification pace tends to be faster than on an SSBN because SSNs operate with less predictable schedule regularity. The wardroom is typically 6-8 junior officers competing for a similar FITREP profile, which means every visible performance difference matters. The Virginia-class SSNs are newer hulls with more modern systems; the Los Angeles-class boats are older platforms with more maintenance demands. Either assignment is a real submarine.
  • SSBN (ballistic missile submarine — Ohio class)
    The SSBN operates a two-crew (Blue/Gold) rotation system — each crew alternates between strategic deterrence patrols and training/maintenance periods ashore or in port. The patrol cycle is operationally isolated in ways the SSN tour is not: SSBN patrols are extended submerged deterrence runs with limited communication. The personnel reliability program requirements add a certification layer on top of the basic submarine qualification. The SSBN division officer cohort is typically smaller than on a comparably-sized SSN wardroom because the crew size per boat is smaller. The shore periods are genuinely different from the SSN patrol tempo — more predictable, more administrative, and used heavily for training and qualification work. Officers who want maximum operational variety in the first tour should express an SSN preference to the detailer; officers who are comfortable with the structured patrol cycle and want the strategic mission context may find the SSBN assignment well-suited.
  • SSGN (guided missile submarine — Ohio-class conversion)
    The SSGN (converted Ohio-class boats capable of carrying Tomahawk cruise missiles and supporting special operations forces) is a distinct operational community within the submarine force. SSGN wardrooms are larger than SSN wardrooms and the mission set includes strike and SOF support in addition to conventional submarine missions. SSGN division officer assignments are less common as a first tour than SSN or SSBN billets; they appear more often at the department head level. An SSGN assignment as a first-tour DO is a genuinely unusual first-tour context.
  • Shore staff / training commands during the pipeline (NNPTC, SOBC)
    Nuclear Power School and SOBC are institutional organizations with their own wardrooms and chain of command — officers assigned as instructors at NPS or SOBC are a separate billet type from the first-tour sea assignment. JO instructor assignments at NNPTC or SOBC are post-first-tour billets for officers who have completed the pipeline and received the dolphins. The pipeline experience for a first-tour ENS/LTJG is entirely at NPS/NPTU as a student and at SOBC as a student before the first boat assignment. There is no hybrid pipeline-and-fleet first tour.

What Good Looks Like at This Rank

The good ENS/LTJG submarine warfare officer earns dolphins on schedule — not because he is the smartest officer in the pipeline, but because he started the PQS binder from the first week aboard, conducted every system interview from genuine preparation rather than signature pressure, and walked into the qualification board with enough depth to answer the second and third follow-on question without collapsing. The department head does not rewrite his EVALs. The chief runs divisional problems to the division officer first — not to the XO — because the chief has determined that this officer is worth working with rather than around. The XO does not have to follow up on the morning brief because the division officer already knows his numbers. The COB knows the officer's name because the division petty officers said something good, not because there was a problem that required escalation. The observable differentiators at this tier are specific and repeatable. The officer who is performing at the top of the JO cohort has logged every underway period deliberately — not just standing watch, but tracking qualification milestones against the timeline, noting which challenging evolutions he handled and which ones required the COB to step in, and building the record that the OOD endorsement conversation will reference. He treated NPTU as a real performance event, not a pipeline stop, and the EOOW qualification board reflects it. His division's maintenance schedule does not have unexplained deferred items at the department head sync. When a sailor in the division has a personal problem, the chief brings it to the division officer before it becomes an NJP event — because the officer is present, engaged, and trusted enough to be a useful first stop. The third differentiator the wardroom watches without advertising is intellectual honesty under pressure. On a nuclear submarine, the officer who says 'I don't know the answer to that — let me check the system and come back' in a technical discussion is trusted more than the officer who generates a confident wrong answer and doubles down. The nuclear community selected for intellectual confidence; the submarine community needs officers who know the boundary of their own competence. The ENS/LTJG who figures out that distinction before the first reactor plant casualty drill has a foundation the rest of the career can build on.

Preview — The Next Rank

O-3 (Lieutenant) is when the 1120 community decides whether an officer is on the Submarine Officer Advanced Course track. SOAC at Naval Station Groton is the department head school prerequisite — the gated course that directly feeds the Key Developmental department head tour — and selection is competitive. NPC reads the first-tour FITREP relative rankings, the dolphin qualification timeline, the inter-tour billet performance, and the year-group competition. The officers who do not select for SOAC do not command submarines. That is the honest binary outcome and it happens in every year-group. The department head tour — 18-24 months as Engineer Officer (ENG), Weapons Officer (WEPS), or Navigator (NAV) on a commissioned SSN, SSBN, or SSGN — is the KD billet for the 1120 community. It is the exact equivalent of company command in the Army or a KD department head tour for SWOs. The ENG billet is the most technically demanding of the three: the Engineer Officer is personally accountable to the CO and to the Naval Reactors program for the reactor plant's material condition, watchstander qualification currency, and procedural compliance. The Naval Reactors representative interacts with the ENG directly — the accountability chain is not buffered by the CO. The WEPS owns the submarine's weapons systems and fire control. The NAV owns navigation systems, charts, and bridge qualification programs. All three billets are running a department of chiefs and petty officers who have been operating their systems for years; the department head who cannot earn their respect through demonstrated competence runs the department around them rather than with them, and that pattern is visible in every brief the CO receives. The load that comes with the LT and LCDR window is different from the division officer load in a specific way: the stakes of every FITREP you write are higher. At ENS/LTJG you were writing EVALs on enlisted sailors. At LT/LCDR you are writing FITREPs on junior officers whose careers are shaped by the relative rankings and narrative bullets you produce. The submarine community is small and interconnected; a department head who inflates FITREPs or writes vague narratives is providing bad signal to the LCDR board and the command screen, and the community traces inflation back to the rater. Write what is true. The next level asks you to be the person who produces the honest record, not just the person who receives one.
FAQ

1120 O1-O2 — Frequently Asked Questions

Q01What does a O1-O2 1120 (Submarine Warfare Officer) actually do?
You commission through USNA, NROTC, or OCS and pass the Prospective Nuclear Officer (PNO) interview — a face-to-face with the Director of Naval Reactors, the only community in the Navy where the Admiral personally screens every candidate before accession.
Q02What's the most important thing to know as a O1-O2 1120?
1120 Submarine Warfare Officer is the only Navy community where a flag officer personally interviews every candidate before accession.
Q03What does a typical day look like for a O1-O2 1120?
Time-blocked day at the O1-O2 1120 rank tier: 0500 Wake. On a nuclear submarine underway, the watch rotation defines the day — 0500 on port-and-starboard does not mean morning quarters, it means you are either going on watch, coming off watch, or in the three-hour window between. Check the 1MC (ship's general announcing system) log for any overnight engineering or tactical events that affect your division or your watch, 0530 PT — underway, the submarine's gym spaces are minimal and the schedule is compressed around the watch rotation.…
Q04What mistakes get O1-O2 1120 soldiers fired or relieved?
Missing the dolphin qualification timeline — dolphins earned late are a visible flag in the wardroom and the FITREP. The board does not fail officers who prepared; it exposes officers who chased signatures without learning the systems. Late dolphins signal the wrong thing to the CO writing the first FITREP; DUI, NJP, or conduct violation during the pipeline or first sea tour.…
Q05What career decisions matter most at the O1-O2 1120 rank tier?
Community transfer out of the submarine community — the window is narrow and closes fast — The window for community transfer out of the 1120 designator is effectively the first two years commissioned, before the ADSO tied to nuclear program training locks the officer in. After NPS and NPTU the service obligation incurred by nuclear training is real and documented; NPC detailing and the Naval Reactors program both track it.…
Q06What's next after O1-O2 for a 1120 (Submarine Warfare Officer) in the Navy?
O-3 (Lieutenant) is when the 1120 community decides whether an officer is on the Submarine Officer Advanced Course track.
Q07What manuals and regulations does a O1-O2 1120 need to know cold?
OPNAVINST 1412.14 (or successor) — Submarine Warfare Officer Qualification Program; the governing instruction defining qualification requirements, timeline standards, and the board process for earning the submarine warfare insignia.; NAVPERS 18068F (Rate Manual / Naval Military Personnel Manual) and MILPERSMAN 1000-series — personnel policy governing your division's enlisted advancement, administrative separations, and the NJP process; know the articles your division's Sailors live under.;…

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