The Marine Corps does a pretty good job and the YATS-YAS boys are almost fanatical about how they trace the history (its one of the one few "mafias" inside the Marine Corps that maintains a link between its past, present and future) of its Amphibious Combat Vehicles.
One thing they have dropped the ball on are some of the experimental Landing Vehicle Tracked Personnel (LVTP) that have come down the line. The Experimental M-113 based model is one of them. Check out the pics below.
I call it a M-113 based model but I think it might pre-date that vehicle and might be based on an even earlier Army vehicle. I do know that the concept was refined and we saw this proposed (pics below).
It irks me that additional information on these vehicles isn't available. I've gone to the wayback machine on the web and tried to see if the FMC site had any info and it's a no-go. I've checked out my collection of Hunnicut books to see if they had any, hell I've even checked out various old editions of JANES to see if they had any info and it's all NEGATIVE!
Last chance is to see if Foss knows anything and of course you guys.
If you have real deal info then hook me up. I don't need guesses, speculation or theory. I want REAL information on this rig!