It was, and still is, the largest seaborne invasion in history. 24,000 American, British, and Canadian troops ran toward hills littered with German machine guns, snipers, mortars, and mines knowing there was a good chance that they were going to die. 4,414 men died that day alone. 70 years later, and we have the freedom, lifestyle and privileges that we do because of their sacrifice.
What should you do to honor their sacrifice? Personally, nothing. Just keep that appreciative thought in the back of your mind that they gave their lives so that you could have a better one.
'Murica. For real.