At about 2,000 years old, the “Ship of Theseus” puzzle still feels resonant: if every part of a ship is replaced, is it still the same ship? The modern U.S. Navy faces the reverse dilemma—what happens when decades pass and the world has changed, but the ship remains essentially the same? The U.S. builds “the best warships in the world,” said Rylan Hamilton, CEO and cofounder of autonomous vessel startup Blue Water Autonomy. “They can get hit by a missile, and still operate and survive. But to ge...