ICBM vs SLBM: How Land- and Sea-Based Nuclear Missiles Compare
ICBM vs SLBM explained: how Minuteman III silo missiles and Trident II D5 submarine missiles differ in basing, range, survivability and numbers.
Short answer: In the ICBM vs SLBM comparison, both are long-range ballistic missiles that can carry nuclear warheads, but they are based differently. An intercontinental ballistic missile (ICBM) sits in a hardened underground silo on land, where it is ready to launch within minutes but its location is known. A submarine-launched ballistic missile (SLBM) rides aboard a submarine hidden at sea, which makes it the hardest part of the U.S. nuclear force for an enemy to find. The U.S. fields 400 Minuteman III ICBMs in three states and Trident II D5 SLBMs on 14 Ohio-class submarines.
Last updated: October 28, 2026
- ICBM in U.S. service: LGM-30G Minuteman III, 400 deployed
- SLBM in U.S. service: Trident II D5 (D5LE), up to 20 per Ohio-class boat
- Range: Minuteman III 6,000+ miles; Trident II D5 4,000 nautical miles
- Basing: ICBMs in silos in Wyoming, Montana and North Dakota; SLBMs on submarines at sea
- Replacements coming: Sentinel ICBM and the Columbia-class submarine
- Main trade-off: ICBMs are numerous and always on alert; SLBMs are hard to find and built to survive a first strike
ICBM vs SLBM: the core difference
Both weapons follow a ballistic path. A rocket booster pushes the missile out of the atmosphere, and its warheads then fall back toward their targets on an arc, much like a thrown ball. For the basics of that flight path, see our guide to ballistic missiles vs cruise missiles.
The difference is where the missile waits. The U.S. Air Force Minuteman III fact sheet describes a missile kept in underground launch facilities and controlled by two-officer crews in launch control centers. The Navy’s Trident II D5 fact file describes a missile carried in launch tubes on a submarine. The Navy calls the submarine force a source of “assured second-strike” capability, meaning it is designed to survive a surprise attack and still respond.
Specs side by side
Figures come from the Air Force and Navy fact sheets.
| Feature | LGM-30G Minuteman III (ICBM) | Trident II D5 (SLBM) |
|---|---|---|
| Service | U.S. Air Force | U.S. Navy (also the UK Royal Navy) |
| Basing | Underground silos | Ohio-class submarines (and UK Vanguard class) |
| Range | 6,000+ miles | 4,000 nautical miles (4,600 statute miles) |
| Weight | 79,432 lb | 130,000 lb |
| Warheads | Not listed in the fact sheet | Multiple independently targetable reentry vehicles (W76 or W88) |
| Speed | About 15,000 mph (Mach 23) at burnout | Not listed |
| Guidance | Inertial | Inertial |
| In service since | June 1970 | 1990 (D5LE version since 2017) |
| Number deployed | 400 | Up to 20 per Ohio-class submarine; 14 submarines |
| Replacement | LGM-35A Sentinel | Columbia-class submarines will carry the D5LE |
How ICBMs are based
The Air Force says its 400 Minuteman III missiles are spread across F.E. Warren Air Force Base in Wyoming, Malmstrom Air Force Base in Montana and Minot Air Force Base in North Dakota. Each missile sits in its own hardened silo, linked to an underground launch control center staffed by two officers. The fact sheet adds that Navy E-6B aircraft can take over and launch the missiles through an airborne launch control system if ground centers lose contact.
Silo basing has two strengths. The missiles are always on alert, and an attacker would need to strike hundreds of separate silos to disarm the force. Its weakness is that every silo’s location is known.
The Minuteman III was first deployed in June 1970 and has been upgraded many times. The Air Force plans to replace it with the LGM-35A Sentinel. The Congressional Research Service primer on Sentinel says the program breached cost limits under the Nunn-McCurdy law, with the per-unit cost estimate rising from $118 million to $162 million. The Air Force requested $4.6 billion for Sentinel in fiscal 2027. Our report on Sentinel’s new silo plan covers the basing changes.
How SLBMs are based
The Navy’s ballistic missile submarine fact file says the U.S. operates 14 Ohio-class submarines, each with 20 missile tubes in use under New START treaty limits. Each boat is 560 feet long, displaces 18,750 tons submerged and carries a crew of 15 officers and 144 enlisted sailors.
To keep the boats at sea as much as possible, each submarine has two full crews, Blue and Gold, that take turns. A typical cycle is 77 days at sea followed by 35 days in port for maintenance.
The Trident line goes back to the Polaris A1 of 1956. The Navy says each of the six generations since then has improved in range, payload and accuracy. The current D5 is a three-stage, solid-fuel missile, and its life-extended version, the D5LE, entered service in 2017. The United Kingdom also uses the Trident II D5, carrying 16 per Vanguard-class submarine.
The Ohio class is due to be replaced by the Columbia class. The Navy says the first Columbia-class boat must be on patrol by October 2030. The CRS strategic forces primer says 12 Columbia-class submarines are planned, each with 16 launch tubes. Our report on Columbia-class delays tracks the schedule.
Speed, survivability and accuracy
Ballistic flight is extremely fast. The Air Force lists the Minuteman III at about 15,000 mph at burnout.
Survivability is where the two split. A submarine on patrol is very hard to locate, so its missiles are expected to survive a first strike. Silo-based ICBMs could be targeted, but their numbers and dispersal raise the cost of any attack.
Neither fact sheet gives an official accuracy figure. Both list inertial guidance.
How the two fit into the nuclear triad
The U.S. nuclear triad has three legs: land-based ICBMs, submarine-launched missiles and long-range bombers. Our nuclear triad explainer covers all three.
The CRS primer counts 1,419 deployed strategic warheads as of March 2023. In its 2022 table, the submarine force carried the largest share, with 220 deployed Trident missiles carrying 981 warheads. The remaining deployed warheads were split between the Minuteman III force and the bomber fleet.
Peter’s World’s view
The ICBM vs SLBM question is not really about which missile is better. The two legs are built to do different jobs. Submarines provide survivability, and silos provide numbers and readiness that an adversary must plan around. Both are now in costly replacement programs at the same time, with Sentinel over budget and the Columbia class under schedule pressure. That makes the 2030s a period in which the U.S. will run old and new systems side by side, and in which budget decisions on one leg affect the other.
Frequently asked questions
What is the difference between an ICBM and an SLBM?
An ICBM is launched from a fixed silo on land, while an SLBM is launched from a submarine. Both are long-range ballistic missiles that can carry nuclear warheads.
Which has longer range, an ICBM or an SLBM?
In U.S. service, the Minuteman III ICBM is listed at more than 6,000 miles. The Trident II D5 SLBM is listed at 4,000 nautical miles, or about 4,600 miles, but a submarine can move closer to its targets.
How many ICBMs does the U.S. have?
The Air Force lists 400 deployed Minuteman III missiles at bases in Wyoming, Montana and North Dakota.
How many missiles does an Ohio-class submarine carry?
Each of the 14 Ohio-class ballistic missile submarines has 20 tubes in use for Trident II D5 missiles.
Why are SLBMs considered more survivable?
A submarine on patrol is very hard to find, so its missiles are likely to survive a surprise attack. Silo locations, by contrast, are fixed and known.
What will replace the Minuteman III and the Ohio class?
The LGM-35A Sentinel will replace the Minuteman III, and the Columbia-class submarine will replace the Ohio class, with the first Columbia boat required on patrol by October 2030.
This article was written by Peter with AI assistance and checked against the sources linked. See our AI use disclosure.
Sources
- U.S. Air Force: LGM-30G Minuteman III fact sheet
- U.S. Navy: Trident II D5 missile fact file
- Congressional Research Service: Defense Primer: LGM-35A Sentinel ICBM (IF11681)
- U.S. Navy: Fleet ballistic missile submarines (SSBN) fact file
- Congressional Research Service: Defense Primer: Strategic Nuclear Forces (IF10519)
Additional sources
- DVIDS: Trident II D5 flight test compilation video
- DVIDS: GT256 Minuteman III ICBM test launch (narrated)
- Peter’s World reference guides
