>If these are what I think they are they are called LVT(A)4's. These were
>standeard ww 2 amtraks built with thin armor plating and turrets mounting a
>75mm howitzer. [...] These "AMTANKS" were used in
>first waves of invasions for fire support.
Did US forces ever use the "Duplex Drive" amphibious equipment, other
than for the D Day / Western Europe landings ?
Duplex Drive was a canvas screen erected around the perimeter of a
fairly standard gun tank (mainly Shermans, but Valentines were also
used). Water drive was by means of a pair of propellors coupled to the
rear track roller. On a front-drive Sherman, this involved the normal
tensioner roller being fitted with a second sprocket, like the front
sprocket.
-- Smert' Spamionem