The possiblilties are endless just for a 4 June landing. The tides would have been different by a part of a hour, the cross currents near the beaches different and thrown the guide boats off in different directions. Different German officers and senior sergeants would have been on the midnight watch in the HQs and made different decisions as the reports of aircraft, paratroops, and ships came in.

Change to a few weeks earlier and there are different German regiments defending several beaches. The defense of Omanha beach was quite weak in May. Roll back ten or eleven months to the summer of 1943 and the entire thing becomes very different.