How did World War I affect women's roles?

During World War I, women were drafted into various new roles that previously had only been open to men. Many women served as nurses during the war, helping to take care of the soldiers who had been wounded in action. Other women worked to operate telephone switchboards connecting different regiments and branches. These women helped to facilitate communication between troops during the war, a crucial task. Women were also allowed to enlist for the first time ever in World War I, and many took this opportunity to serve as soldiers in the United States Military.
Those who did not serve in the military nor as nurses still had many opportunities, as many of the jobs normally occupied by men were now empty.