Did not one battalion of tanks decide to ride the LCT's all the way in and therefore were on the beach to support the landings?
"Ninety-six tanks, the Special Engineer Task Force, and eight companies of assault infantry (1,450 men), landing just before and after 0630, were to carry out the first assault missions (Map No. V).
On the right, the 743d Tank Battalion brought in all its tanks on LCT's."
Omaha Beachhead (6 June-13 June 1944) American Forces in Action Series. Historical Division. War Department (Washington, D.C.: Center of Military History, Facsimile Reprint, 1984), pp. 35-87]
My understanding was that a considerable number of these got picked off by guns zoned in on the beaches..