Summary and 4 Points You Need to Know: The U.S. Navy’s Columbia-class submarines, designed to replace the aging Ohio-class vessels and maintain America’s sea-based nuclear deterrent ...

while the Columbia-class ballistic missile submarines also face delays. A total of 18 of a planned 24 Ohio-class ...

Five years ago, for instance, it started building a new class of ballistic missile submarines called Columbia, the perceived replacement for the aging Ohio class. The U.S. Navy plans a fleet of 12 ...

The Columbia submarines are expected to begin replacing Ohio-class vessels from 2031, and to form a 12-strong class over the next two decades, delivering the US nuclear deterrent. Each Columbia-class ...