John F. Kennedy became famous because of his heroics on the PT 109. Maybe he could have become commander of the universe if he piloted the Navy warship of the future. It’s called The Ghost. Built by Juliet Marine Systems, a private company in Portsmouth, N.H., it’s designed to fight swarm attacks, water-born IEDs, and, aargghh, piracy. According to Business Insider, “Ghost is intended to have zero radar signature, and the vessel is supposedly difficult for the enemy to spot, let alone target. The ship is nonmagnetic and hard to detect via sonar, making it ideal for infiltration and surveillance...