DD tanks, Omaha, and how failure shapes memory

Were DD swimming tanks generally unsuccessful because they sank easily?

No. The assessment attributes the Omaha losses to unsuitable launch conditions and points to successful river crossings elsewhere.

The explanation attributes the remembered Omaha losses to a launch in seas rougher than the DD tanks were designed to face. A warning had gone out to take the tanks ashore in their landing craft, and one American unit seems not to have received it. An audience comment adds that the launch was too far out and required the tanks to head into the waves. Successful river crossings and British plans to use DD tanks at Singapore broaden the equipment's record beyond Omaha. The remembered failure consequently needs to be considered alongside the other operations.