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The Navy plans submarine operations as a repeating sequence of training and certification, deployment, and maintenance—not as a fixed calendar that every boat follows exactly. For attack submarines, the Navy’s notional plan describes 12 months of training and certification followed by a six-month deployment, with intermediate maintenance inside operational cycles and much longer depot periods every few cycles. Actual schedules can slip when maintenance takes longer than planned or shipyard capacity is constrained.
What an attack submarine’s planned cycle looks like
The Navy’s broader Optimized Fleet Response Plan integrates commands, activities, operational demands, resources, and schedules. Submarines deploy independently and follow type-commander certification directives, with cycle lengths that can vary by platform and force. In fiscal year 2025, the Navy’s 44 Los Angeles- and Virginia-class attack submarines followed the Fleet Response Training Plan (FRTP), according to the Government Accountability Office (GAO).
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| Phase | Notional duration or timing | What it means |
|---|---|---|
| Training and certification | 12 months | Preparation and certification before deployment, as described by Navy officials to GAO. |
| Deployment | Six months | A notional deployment duration, not a guaranteed length for an individual boat. |
| Stand-down after deployment | 30 days | When included, this makes about 19 months between full cycles. |
| Extensive depot maintenance | 24–36 months | A long maintenance period that may follow three to four operational cycles. |
The 12-month training-and-certification period plus the notional six-month deployment is an 18-month operational cycle. Adding the 30-day post-deployment stand-down brings the interval between full cycles to about 19 months. These are Navy-described planning patterns reported by GAO, not a universal schedule or a promise that a specific submarine will deploy for six months.
Intermediate maintenance is part of the operational cycle
Submarines also conduct intermediate maintenance and specified training evolutions within operational cycles. Intermediate work is distinct from a major depot period: it supports the ongoing cycle, whereas depot maintenance is more extensive and can keep a boat in maintenance for years.
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Depot maintenance follows several cycles
Attack submarines may complete three to four operational cycles before an extensive depot maintenance period lasting 24 to 36 months. These notional durations should not be treated as a schedule for every submarine class, mission, or individual boat.
Who plans and carries out submarine maintenance
Maintenance planning is spread across Navy organizations because it has to align operational requirements, technical work, people, materials, and shipyard capacity. GAO describes the responsibilities as follows:
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- Office of the Chief of Naval Operations (OPNAV): coordinates global force management of ships and submarines.
- Fleet commanders: oversee force generation, standards, metrics, readiness assessments, and certification.
- Type commanders: train and oversee readiness and maintenance for their platforms.
- Naval Sea Systems Command (NAVSEA): oversees ship and submarine design, construction, delivery, and maintenance.
- Navy Personnel Command: handles sailor assignments.
- Naval Supply Systems Command (NAVSUP): oversees supply policies and material.
SUBMEPP develops maintenance requirements
Within NAVSEA, the Submarine Maintenance Engineering, Planning and Procurement (SUBMEPP) Availability Planning Division identifies maintenance and modernization requirements across submarine classes. It coordinates with commanders, squadrons, public and private shipyards, maintenance facilities, and ship’s personnel. SUBMEPP describes the Class Maintenance Plan as the collection of required maintenance for each submarine to help it achieve its full service life. Its material work includes predicting overhaul needs and helping obtain parts and components through the Navy supply system. Some maintenance and modernization work is required to certify continued safe and reliable operations. NAVSEA SUBMEPP Products and Services
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Planning starts before a maintenance availability
The Joint Fleet Maintenance Manual, COMUSFLTFORCOMINST 4790.3 Revision D Change 3, dated November 7, 2023, says detailed planning is a prerequisite to effective continuous maintenance availability execution. It describes planning as beginning before a vessel arrives, with material procurement and job planning. Joint Fleet Maintenance Manual, Revision D Change 3
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Public and private shipyards perform depot work
The four public naval shipyards—Portsmouth, Norfolk, Puget Sound, and Pearl Harbor—provide depot maintenance for attack submarines and other nuclear-powered vessels. Private shipyards General Dynamics Electric Boat and Huntington Ingalls Industries Newport News Shipbuilding build nuclear-powered ships and sometimes perform attack-submarine depot maintenance, according to GAO.
Why actual maintenance and deployment schedules slip
A planned cycle depends on maintenance being completed in time for training, certification, and the next operational phase. When work overruns or a shipyard cannot take a submarine when needed, the boat may remain unavailable longer than planned. GAO’s public report, published August 27, 2026, analyzes data through fiscal year 2025 and documents persistent delays in attack-submarine depot maintenance.
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- At public shipyards, the Navy completed about 11 percent of attack-submarine depot maintenance on time during fiscal years 2016–2025.
- Average depot maintenance periods rose from 744 days in FY2016–2020 to 809 days in FY2021–2025.
- GAO counted 8,906 days of active idle time across FY2016–FY2025. Active idle time peaked at 1,518 days in FY2022 and fell to 166 days in FY2025.
- Inactive idle time for boats awaiting decommissioning reached 1,260 days in FY2025.
Active and inactive idle time are different problems
Active idle time is when an operational submarine and its crew wait pier-side because the boat is no longer certified for normal operations but cannot yet enter maintenance. Inactive idle time is when a submarine designated for decommissioning waits for shipyard capacity to defuel its reactor. The categories describe different stages of a boat’s life and should not be conflated with a planned deployment or maintenance period.
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GAO’s fast-facts summary reports more than 15,000 lost operational days over ten years and an estimated $3.4 billion in costs to sustain crews and submarines providing no operational capability; that headline figure covers maintenance delay and active idle time. The detailed report estimates $4.17 billion in operating and support costs across FY2016–FY2025, expressed in calendar-year 2025 dollars, for maintenance delay and active and inactive idle time. The detailed total includes $722 million for inactive idle time, accounting for the difference in scope between the two figures.
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Decommissioning projections point to future pressure
As of January 2026, Navy projections cited by GAO anticipated that 15 more attack submarines would enter inactive idle time during FY2026–FY2030, amounting to more than 14,000 days and $3.1 billion in operating and support costs without mitigation. These are projections, not observed outcomes. GAO attributes the expected increase largely to aging Los Angeles-class boats reaching the end of their service lives as Virginia-class boats enter the fleet, as well as seismic constraints at Puget Sound Naval Shipyard.
GAO’s 2026 report recommends evaluating more efficient decommissioning options and creating an inactivation plan to reduce inactive idle time. The Navy verbally concurred but did not provide written comments. The GAO landing page listed both recommendations as open when accessed; their status can change. GAO report landing page and recommendation status
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How maintenance fits the Navy’s readiness goals
The Chief of Naval Operations’ 2024 Navigation Plan describes the intended balance this way: “At any given time, in ideal circumstances, one third of our ships and attack submarines should be in maintenance, one third in training, and one third on or ready for deployment.” It links maintenance overruns to disruption of force generation and states a goal: “By 2027, we will achieve and sustain an 80 percent combat surge ready posture for ships, submarines, and aircraft.” The 80 percent figure is a Navy goal, not evidence that the posture has been achieved. CNO Navigation Plan 2024
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GAO’s August 2026 public report specifically excludes sensitive details about attack-submarine operational availability and comparisons with strategic competitors. Its public findings therefore describe maintenance performance and idle time, not the full operational picture of U.S. submarine forces. GAO-26-109256 full public report
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