The Japan Maritime Self-Defense Force increasingly resembles the former Imperial Japanese Navy, but in a smaller size Here's What You Need to Remember:┬аYet to come into focus is whether Tokyo would opt to build a new warship or a derivative of vessels currently in the fleet. TheDrive cited a report from Tokyo's Kyodo News agency, which suggested that the government was considering a vessel with a standard displacement of around 8,000 tons тАУ which would be larger than the current Maya-class's displacement of 8,200 tons. The Japan Maritime Self-Defense Force increasingly resembles the former Imperial Japanese Navy, but in a smaller size. It has a fleet of some 154 ships and operates 346 aircraft. In 2000 it has also been the world's fourth-largest navy by tonnage, and likely will only increase in size.