Do you know the story or the Blue Star Banner? I have one hanging proudly from my window along with an American Flag. I also wear a Blue Star Pin. It's not just for mothers but for anyone whom has an imediate family member whom serves during war.
http://www.bluestarmothers.org/flags.php
The following text is from the Blue Star Mothers website. They have a printable version if your intrested.
"Service Star Flags
Display of the Service Star Banner first came about during World War I. During WWI and WWII most flags were hand made by mothers across the nation. One of the most famous flags was that of the five Sullivan brothers who all perished on the U.S.S. Juneau.
Each blue star on the flag represents a service member in active duty. A gold star is displayed if a service member is killed in action or dies in service. If several stars are displayed in one family the gold star takes the honor of being placed at the top.
Display of a Service Star Banner is done during times of war. Once again families are displaying banners at home. Banners may be purchased through the internet, at stores, or made by hand. Listed to the right are some links that have a detailed history of the flag."