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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Rep. Ken Calvert (R-Calif.), chairman of the House Appropriations defense subcommittee, heavily criticized Secretary of the Navy Carlos Del Toro about significant cost overruns and delays in submarine and ship programs during a closed classified hearing on Sept.…