The photos I’ve seen, the Amphibious Assault Vessel is well off-shore when it releases the tracked anphibious vehicles directly from well of the ship.
I’ve swum (small!) rivers in the old M113. Even after properly preparing for a crossing, I always prayed it didn’t sink, overturn, or get stuck trying to climb up over the opposite bank. And when it made it, it gave me a fresh appreciation for the APC as it doesn’t look like the sort of thing that can do it at all.
Indeed, APCs and Brads swam ponds or rivers and the cargo hatches remained open. These guys button up or for sure the will take breaking waves....
Yes, I also drove the M113 50 years ago, back in the 70’s.
It’s amphibious qualities were questionable at the least.
More than once had to wait for a retriever to come and
pull us out of a swamp or a ditch.
Company Commander not happy.