Memorial Day is celebrated each May to commemorate the people who died in service of the United States of America. Even though barbecues and visions of the upcoming summer weather may command much of the attention come Memorial Day weekend, the holiday really serves as a remembrance for those military members who paid the ultimate sacrifice for their country, as well as the personnel who continue to protect and serve today. Memorial Day origins Memorial Day was first known as Decoration Day and was borne out of the Civil War.