Adding ARIS SPA waterjets to existing M113 Gavins makes them into ship-to-shore, ocean-going "AmphiGavins" to enable U.S. Army Prepositioned Set Sealift Ships to have combat engineers drive off RO-RO ramps into the water to secure beach landing sites and then shuttle men/supplies restoring capabilities lost when the WW2/Korean War DUKWs were not replaced. AmphiGavins can also fly by S-64 AirCrane/SkyCrane, CH-47D/F Chinook, CH-53E/K Super Stallion heavy-lift VTOL helicopters and parachute airdrop/STOL-ESTOL (rockets, tracked or air cushion landing system) airland by fixed-wing C-27J Spartans, C-130 Hercules (and larger) aircraft http://www.combatreform.com/c130.htm ...to effect 3D maneuver over seamines and when ashore are small and fleeting "hunter" platforms of a squad of infantry or if outfitted with small caliber cannon act as "female" tanks or with large-caliber cannon "male" killer tanks. Details: http://www.geocities.com/armysappersforward/amphigavins.htm FYI: the stretched hull MTVL AmphiGavin (6 roadwheels) can carry the absurdly large USMC 13-man infantry squad. The USMC's bloated amtrack personnel carrying requirements are for 20-25 men which creates too large of a target that cannot be adequately armored nor fly by CH-53E helicopter. If the USMC were smart...(such a statement is an oxymoron; marines are the most stupid and egotistical--one creates the other---of all the U.S. welfare recipients in uniform). They want their bloated amtracks and now have an "EFV" that can't even float or drive straight. Who is going to stop marines from killing themselves and calling it glory? There's NOTHING wheels can do that tracks cannot do better and there's a whole hell of a lot things tracks can do that wheels CAN'T DO AT ALL. Want to know more? Our book, "Air-Mech-Strike: Asymmetric Maneuver Warfare for the 21st Century" is ONLINE for FREE skyjacked by Google! http://books.google.com/books?id=RCWtHnYZ0LMC&pg (more)