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Why did the DD Sherman tanks fail to provide much support at Omaha Beach?

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D-Day: Omaha Beach — Omaha Beach U.S. infantrymen wading from their landing craft toward Omaha Beach on D-Day, June 6, 1944.

The "DD" (Duplex Drive) Sherman tanks failed to provide significant support at Omaha Beach primarily because they were unable to navigate the extremely rough sea conditions on D-Day.

These tanks were equipped with extendable and collapsible flotation screens designed to make them buoyant, allowing them to be launched from landing craft at sea and travel to the shore under their own propeller power. However, the choppy waters of the English Channel proved too severe for the specialized equipment. As a result, the vast majority of the tanks launched for the assault sank before reaching the beach; out of 29 tanks launched to support the 116th Regiment, only two successfully made it to the shore.12