U.S. 2 Star Service Flag, WWIl.

U.S. Service Flags, Two Blue Stars, WWIl , Commodore Stephen Decatur Family Collection.
This red and white wool flag is a service flag used to indicate family members are serving in the US Armed Forces. This example from the Lear-Storer-Decatur Families was used to indicate that two members were serving in the U.S. Navy during WWIl.

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