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Smart Bombs: Military, Defense and National Security

Columbia-Class Submarine: The U.S. Navy’s SSBN Future

An artist rendering of the future U.S. Navy Columbia-class ballistic missile submarines. The 12 submarines of the Columbia-class will replace the Ohio-class submarines which are reaching their maximum extended service life. It is planned that the construction of USS Columbia (SSBN-826) will begin in in fiscal year 2021, with delivery in fiscal year 2028, and being on patrol in 2031.

On October 1, 2020, construction began on the future USS Columbia (SSBN-826), the first of a new class of U.S. Navy nuclear-powered submarines to replace the Ohio-class ballistic missile submarines now in service. The program calls for twelve of the new class of boats, which the Navy has identified as a top priority.


Research and development work on the new class of SSBNs has been underway for several years, while advanced procurement (AP) funding for the lead vessel began in fiscal year 2017 (FY17). According to the December 22, 2020 updated Congressional Research Service (CRS) report, “Navy Columbia (SSBN-826) Class Ballistic Missile Submarine Program: Background and Issues for Congress,” the Navy’s proposed FY2021 budget requests

$2,891.5 million (i.e., about $2.9 billion) in procurement funding, $1,123.2 million (i.e., about $1.1 billion) in advance procurement (AP) funding, and $397.3 million in research and development funding for the program. In addition to the future SSBN-826, the Navy has announced that it would procure the second Columbia-class boat – the future USS Wisconsin (SSBN-827) – in FY24.

General Dynamics Electric Boat will perform about seventy-eight percent of the construction, and it reportedly shifted the program to full-scale construction at the company’s manufacturing complex in Quonset Point, Rhode Island – where construction of four of the six “supermodules” will take place. Following the completion of the modules, all will be transported by barge to Electric Boat’s Final Test and Assembly facility in Groton, Connecticut.

Critical Component of the Nuclear Triad

The SSBNs are seen as a critical component of the U.S. military, as the SSBNs now carry seventy percent of the U.S. operational nuclear deterrent arsenal and are considered the most survivable leg of the nation’s nuclear triad. At issue is that the current Ohio-class SSBNs will begin to reach their end of service life in 2027 – and as a result between 2032 and 2040, the Navy will only have the minimum SSBN force structure deemed necessary to meet the United States Strategic Command (USSTRATCOM) strategic deterrent requirements.


Early rendering of what Columbia-class could look like

An early rendering of what Columbia-class could look like

According to the Submarine Industrial Base Council, the third-party organization representing the more than 4,000 companies across all 50 states, “Delivery of the Columbia Class on schedule maintains the minimum force structure necessary to meet USSTRATCOM’s requirements. The existing Ohio Class SSBNs’ service lives have been extended from an initial 30 years to an unprecedented 42 years. There is no margin to further extend the service life of the current SSBNs which will begin to reach their end of service life in 2027.

The new Columbia-class will be the largest submarines ever built by the United States. The subs are 560 feet in length with a beam of 43 feet. The class is being constructed with a life-of-ship reactor, which will result in a shorter mid-life maintenance period. Each of the boats is designed to serve a forty-two-year service life.

According to the recent CRS report, the Columbia-class will include a total of 16 SLBM tubes, as opposed to 24 SLBM tubes (of which 20 are now used for SLBMs) on Ohio-class SSBNs.

Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers and websites. He regularly writes about military small arms, and is the author of several books on military headgear including A Gallery of Military Headdress, which is available on

Editor’s Note: This piece has been updated for greater clarity since publication. 

Written By

Expert Biography: A Senior Editor for 1945, Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers, and websites with over 3,000 published pieces over a twenty-year career in journalism. He regularly writes about military hardware, firearms history, cybersecurity, and international affairs. Peter is also a Contributing Writer for Forbes. You can follow him on Twitter: @PeterSuciu.



  1. Tom C

    January 5, 2021 at 7:32 am

    Not sure I get the point of your last paragraph.

    Existing Ohio: 24 tubes x 14 boats = 336 total tubes
    Planned Columbia: 16 tubes x 12 boats = 192 total tubes

    That’s certainly a smaller fleet, given that it’s barely half the launch capability, so why is that a good thing?

  2. David Gallup

    January 5, 2021 at 8:24 am

    I am trying to make some sense out of your final paragraph, i.e., to deduce how “sixteen ballistic missile launch tubes on the Columbia-class will replace the twenty-four tubes on the Ohio-class”. When fully fielded, the entire COLUMBIA class will provide a total of 192 missiles vs the OHIO class’s 336. Unless the number of MIRV warheads per missile is increased, there exists a significant armament disparity between the classes. Clearly, there appears to be a potentially sizeable reduction in capital acquisition costs, but that would be where the benefit ends. Your thesis appears to be saying that somehow this would “will allow the U.S. Navy to maintain a smaller overall force structure” to achieve the same deterrent posture as with OHIO. This is simply not true. The very complex calculus of equivalency depends on many factors external to the basic asset calculation. Your article ignores important elements such as our national nuclear deterrent posture relative to current offsetting nuclear threat assessments. My background includes construction engineering support of three of the first four of the OHIO class at Electric Boat.

  3. David Gallup

    January 6, 2021 at 7:22 am

    Overnight edit of the last paragraph is noted and appreciated.

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    October 26, 2021 at 5:56 am

    Wow, superb blog layout! How lengthy have you ever been blogging for? you made blogging glance easy. The whole glance of your site is excellent, let alone the content!!

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