Artist rendering of the future Columbia-class nuclear-armed ballistic missile submarine (SSBN), which will replace the Ohio-class submarines. (Illustration: U.S. Navy)
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Huntington Ingalls Industries [HII] won a $2.2 billion contract modification from prime contractor General Dynamics Electric Boat [GD] to help build the first two Columbia-class ballistic missile submarines (SSBNs), the company said Nov. 23.
GD is the prime…