What you want ,but don't even realize, is the US Marine Corps AAAV.  Advanced Amphibious Assault  Vehicle.  Finishing final testing and design in 2006-2007, we have been told that it will start entering the fleet in 2007.  It is replacing the AAV originally produced in 1976.  
With a crew of three, a 30 mm bushwhacker cannon, with the most advanced targeting system for any armed vehicle, it will do over 25 knotsin the water, weighing in over 72,000 pounds!  Fully loaded with 18 combat ready Marines, and hitting any beach from "over the horizon".  In water mode the hull is almost boat like, then coming up to shore, just like a transformer toy the tracks deploy and it hits the beach!  Powered by an engine with over 2500 HP, she  can reach speeds over 65 mph! 
            Comparison of Selected AAAV Requirements
                    With AAV's Current Capabilities
Function                            AAAV requirement    AAV capability
------------------------------  ------------------  ------------------
Water speed                     23-29 miles per     6-8 miles per hour
Cross-country land speed   Keep up with main   15-20 miles per
                                        battle tank, which  hour
                                        travels at about
                                        30 miles per hour
Range on water                  65 miles             45 miles
Range on land                   300 miles            300 miles
Troop-carrying capacity      18 combat-          18 combat-
                                        equipped troops     equipped troops
Survivability (armor           Survive 14.5mm      Can only survive
protection)                        bullets without      14.5mm bullets if
                                       attaching enhanced  enhanced armor
                                       armor plating to    plating has been
                                       vehicle's hull      attached to vehicle's hull
Lethality (main armament)       Defeat light        40mm and .50
                                             armored combat      caliber machine
                                             vehicles of 2005-   guns, which cannot
                                             2025 time frame     defeat light
                                             during day and      armored combat
                                             night while moving  vehicles of today
AAV: 
http://www.globalsecurity.org/military/ … 1-pics.htmAAAV: 
http://www.efv.usmc.mil/
			Last edited by (T)eflon(S)hadow (2006-02-03 00:44:55)