The United States needs to maintain its advantage in submarines and other undersea vehicles over China and Russia, Rear Adm. William Houston said Wednesday. Houston, the director of undersea warfare, said at a symposium hosted by the Naval Submarine League that the United States needs to meet growing threats posed by both Russia and China. "Our undersea forces are going to be absolutely critical to all domain warfare," he said. Houston said China is growing its capacity and capability. "They...