The first really large-scale employment of women as Naval personnel took place to meet the severe clerical shortages of the World War I era. The Naval Reserve Act of 1916 had conspicuously omitted mention of gender as a condition for service, leading to formal permission to begin enlisting women in mid-March 1917, shortly before the United States entered the "Great War". Nearly six hundred Yeomen (Female) were on duty by the end of April 1917, a number that had grown to over eleven thousand in December 1918, shortly after the Armistice. http://www.history.navy.mil/photos/prs-tpic/females/yeoman-f.htm