D-Day is a very biased example since only two or three US Divisions in that invasion had even seen combat (the 82nd, and 1st are the ones I know of, maybe some of the Ranger Divisions did too, I'm not sure).
The few other US divisions that had seen combat at the time were still fighting in Italy and stayed there for most of the war or were diverted to the southern France invasion, Operation Dragoon (which was meant to be conducted in concert with Overlord but could not due to lack of ships).
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