Writing Prompt: Remembering

This weekend marks Memorial Day in the United States, a day to remember the men and women who fought and died in the armed forces. If your story is set in a different world, do they have a similar custom? How do they remember those who died for their land? If it's set in our world (or some near variant thereof), does Memorial Day mean anything for your characters besides an excuse to go shopping or the day they can start wearing white again?