Landings on Rendova happened on 1943-06-30.
Normandy landings happened on 1944-06-06.
Landings at Cape Torokina happened on 1943-11-01.
American airborne landings in Normandy happened on 1944-07-13.
Normandy, France
1969 - 1972
It had to happen because they had to liberate France, but also catch the Germans by surprise.
There is no proof the Apollo landings did not happen, quite simply because they did happen.
6 June 1944
For Skirmish Dday you have to call. I assume it is the same for Oklahoma and other big dday games also.
Operation Overlord began on D-Day 6th June 1944 with the Normandy landings.
http://www.britannica.com/dday