Given the relatively soft nature of submarines, modern anti-submarine aerial torpedoes are much smaller than anti-ship aerial torpedoes of the past, and often classified as light weight torpedoes. They are also often of cross-platform design, able to deploy from both aircraft and surface ships. Examples include the American Mark 46, Mark 50 and Mark 54 torpedoes. There are few if any aerial torpedo designs that are also used by submarines, owing to the significantly reduced capability of aerial torpedoes compared with their full-sized submarine counterparts such as the American Mark 48 torpedo.