Shortly after World War I, the Gold Star Mothers Club was formed in the United States to provide support for mothers who lost sons or daughters in the war. The name came from the custom of families of servicemen hanging a Service Flag in their windows. A Service Flag would have a star for each family member in the military embroidered on it. Living servicemen were represented by a blue star and those who were killed in action were represented by a gold star. For more information Gold Star Family Day.