Women in war. Machine gun production. With swift, deft movements, this young worker, one of 2,000 women employed in a Midwest war plant, assembles barrel carriers of machine guns. It's a job requiring constant attention, speed and judgement; a job for which women have proven themselves better fitted than men. Site: a Midwest plant converted from the manufacture of spark plugs to machine guns. A.C. Spark Plugs. Sourced from the Library of Congress.