She worked as a riveter at the Willow Run Aircraft Factory in Ypsilanti, Michigan, building B-24 bombers for the U.S. Army Air Forces. Monroe was asked to star in a promotional film about the war effort at home. The song "Rosie the Riveter" was popular at the time,[2] and Monroe happened to best fit the description of the worker depicted in the song.[22] "Rosie" went on to become perhaps the most widely recognized icon of that era.