On June 6, 1944, Allied forces landed in Normandy, France. It was the beginning of the end of Nazi Germany's occupation of Western Europe. Together with the far larger and more deadly battles on the Eastern Front at the same time, it signaled the impending doom of that most evil of empires.
My parents both went through World War II, my father in uniform, my mother on the so-called Home Front. The experience changed them forever. It was one of the truly pivotal conflicts in the history of humankind, and still resonates to this day. Here are some video clips that say, better than I can, why that is so, and why the commemoration of D-Day is so important. I'll let them speak to the occasion.
May all who died on D-Day rest in peace, and may their sins be forgiven them; and may the same grace be given to its survivors, those who have died since and those who are still alive. May we never forget their sacrifice.