Did they use DD Shermans in the Pacific?
Too late for anywhere but Okinawa.
The T6 flotation device, much better seaworthiness than the DD tanks using curtains. However the flotation pontoons could be caught by reefs at low tide, etc., leaving the tank stranded.
...The T-6 consists essentially of six steel pontoons;one pontoon on each side of the tank, one on the bow, one on the rear, with bow extension and rear extension pontoons which hinge upward for more compact stowage prior to launching. The six pontoons are compartmented by sheet steel partitions into many sub-compartments; Sub-compartments are filled with plastic foam-to further ensure buoyancy should the pontoons 'become punctured.T-6 floated tanks are seaworthy, having been success-fully tested in twelve foot waves. The floated tank is forty three feet long and therefore provides a fairly stable gun platform, enabling a tank gunner employing the gyrostabilizer to deliver accurate fire during the beachapproach. Compared with LVT(A)ts (amphibious tanks), the floated tank constitutes a more stable gun platform; the higher velocity and greater accuracy of the stabilized tank gun in comparison with the LVT(A) howitzer and the tank's heavier armor, are important advantages. Pontoonsare jettisonable form inside the tank on reaching the beach. Pontoons are remountable and can be reused.T-6 devices, as used on Okinawa, generally provided adequate flotation but needed further development to improve steering, to increase speed above the 4.2 knots obtained by the tank tracks revolving in the water, and to provide a reverse...
The USMC tanks landed at Okinawa from LCM and LSMs, except for one company each in the 1st and 6th Tank Battalions which used the novel T6 pontoon device to swim tanks into the beach, using their tracks as propulsion. Sometimes, they struggled to get over the reefs, but they did in fact function as designed, and the tank crews detonated explosive charges to shed the pontoons and went into action, albeit a bit low on fuel.
One T6-equipped tank apparently brushed with a destroyer, causing wags to claim the only instance of such a collision at sea;