Back our girls over there United War Work Campaign
The army hired women to serve as telephone operators overseas, as this poster shows. The United War Work Campaign was a combined effort of several organizations, including the Y.W.C.A., to raise money for the war. World War I was the first time in American history that women were officially part of the military and government agencies. But, while women were being encouraged to serve in the war, women were also protesting for their right to vote.
For more on American women telephone operators check out:
Underwood, Clarence. Back our Girls over there United War Work Campaign. 1918. Color lithograph. Library of Congress: Prints and Photographs Division. http://hdl.loc.gov/loc.pnp/cph.3g07709 (Accessed December 12, 2018).