June 6
https://www.history.com/this-day-in-history/june-6/d-day
Incidentally, if you happen to be traveling in the foothills of Western Virginia between Lynchburg and Roanoke the National D Day Memorial is located in Bedford, Va. https://www.dday.org.
Soldiers from Bedford were part of Company A of the 116th Infantry Regiment, 29th Division. 35 Soldiers from that small town were assigned to that Division, 19 died that day, another 4 would lose their lives before the end of the campaign. The greatest proportion of losses of any town in America