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." Hide Caption