I was thinking maybe they don't want to "celebrate" the massacre. But it seems strange that they post something for other tragic events (ie 9/11 & Pearl Harbor) but not D Day.
Over 425,000 Allied and German troops were killed, wounded or went missing during the Battle of Normandy. This figure includes over 209,000 Allied casualties, with nearly 37,000 dead amongst the ground forces and a further 16,714 deaths amongst the Allied air forces.