In August of 1942 the USS Argonaut left Pearl Harbor on a mission unlike any she had ever undertaken. Built as a mine-laying submarine, she was slow, heavy, and awkward in comparison to the fleet boats that now carried the war westward. But her broad hull and ample internal space made her a fit for something no one had tried before. Along with USS Nautilus, Argonaut carried Carlson’s Raiders, two hundred twenty-one Marines with orders to strike Makin Atoll, inflict damage, confuse the enemy, and get back out alive. It was the first time the Navy would send a submarine into battle not just as a hunter of ships, but as a troop transport. For Argonaut’s crew, used to torpedoes and patrols, this felt like stepping into a different kind of war.