This post at Hot Air says it far better than I could.

Sixty-four years ago today, Allied forces swept onto the beaches of Normandy to liberate France and put an end to Nazi domination of Europe. The D-Day assault comprised American, Canadian, and British forces, but the Americans led, and for the most part the Americans bled, especially on Omaha. This position of leadership and sacrifice heralded the emergence of America as the primary Western power, but on that day, no one could say for sure that we would succeed:

Go read the whole thing. We owe a debt of gratitude to those troops, many thousands who gave their lives to free Europe.

Hattip Meryl.