Drone swarms and stealth submarines are playing a growing role in modern warfare, yet aircraft carriers remain a symbol of military might.That can be seen in China’s investment in the warships, as well as other countries including France, Turkey, India and Japan.China’s naval fleet has been expanding at a rapid pace, with its fourth aircraft carrier fast taking shape, according to the latest satellite images of the shipyard in Dalian in the country’s northeast, where it is being built.Those...