Naval fleet
One of the deficiencies of the Fleet Marine Force was a lack of fast transport ships that could keep up with a Naval fleet. Until fast attack transports entered the Navy, either the fleet would have to keep its speed down to the speed of the transport ships, or the fleet would have to split in two components; neither option was desirable. With the start of World War II in 1939, a group was formed to come up with a solution that could be rapidly implemented. The group found a large number of destroyers built for the First World War that were in the mothball fleet. These destroyers had four boilers and four smoke stacks and were fast enough to keep up with the fleet. The group discovered that by removing two boilers and smoke stacks room could be found to quarter a company of 130 Marines who would be landed by inflatable boats. These high speed transports were named APDs by the Navy. The APDs later had four Higgins boats attached to them.