"The Seawolf-class attack submarine USS Jimmy Carter is moored in a Washington state facility that reduces a ship's electromagnetic signature in 2006. The Jimmy Carter is 100 feet longer than the first two subs in its class. The extra space is for a ""multimission platform,"" the Navy says. ""This hull section provides for additional payloads to accommodate advanced technology used to carry out classified research and development and for enhanced warfighting capabilities."""
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