Reuters is reporting that Mitsubishi Heavy Industries in Japan has built a prototype of an amphibious assault vehicle. The article notes that the prototype uses engines adapted from the main battle tank made by Mitsubishi as well as new water jet propulsion technology. The full size prototype is undergoing pool tests and is likely several years from being ready for production. The goal of the project is stated as producing an AAV (amphibious armored vehicle) that can move through water at 20 to 25 knots. For the sake of comparison, the AAV7 used by the US Marine Corps has a water speed of 7 knots. Little other information is given in the article describing the prototype.