Nov. 11 will mark 100 years since World War I ended. More than four million Americans served in the armed forces during the war, and millions more people from other countries fought on battlefields across Europe even before the United States entered the conflict.

We want to hear from readers whose family members served in the military or supported the war effort another way during World War I. We’re looking for photos, anecdotes, journal entries and more. In the form below, tell us the one story that was passed down through your family that you never forgot.

Alternatively, if you or your family commemorated the World War I centennial this year, please tell us about that experience and send us a photo.