Clarence Oliver The Service Star (aka The Flag of Mothers) is an American silent film directed by Charles Miller.

The film stars Madge Kennedy as a young woman who pretends to be the fiancée of a famous flying ace during World War I.

[2] Marilyn March (Madge Kennedy), a plain young girl from the country, lonely and unhappy because she alone of all the girls in her town does not have a soldier sweetheart, When she moves to Washington, D.C. at the outbreak of World War I, she begins to pretend to be the fiancée of John Whitney Marshall (Clarence Oliver), a famous combat aviator, and places a service star in her window.

When Mrs. Marshall (Maude Turner Gordon) the flyer's mother, learns of the "engagement," she accepts the girl as her future daughter-in-law, just in time for complications to arise in the form of the truth.

While on location in Long Island, a parade of American Civil War veterans who gave a tribute to drafted boys leaving for boot camp was incorporated into the film.