American women in World War II became involved in many tasks they rarely had before; as the war involved global conflict on an unprecedented scale, the absolute urgency of mobilizing the entire population made the expansion of the role of women inevitable. Their services were recruited through a variety of methods, including posters and other print advertising, as well as popular songs. Among the most iconic images were those depicting "Rosie the Riveter", a woman factory laborer performing what was previously considered man's work.