The United States Navy Nurse Corps was officially established in 1908; it was all-female until 1965.[3][4] After the establishment of the Nurse Corps in 1908 by an Act of Congress, twenty women were selected as the first members and assigned to the Naval Medical School Hospital in Washington, D.C. However, the navy did not provide room or board for them, and so the nurses rented their own house and provided their own meals.[5] In time, the nurses would come to be known as "The Sacred Twenty" because they were the first women to serve formally as members of the Navy. The "Sacred Twenty" were Mary H. Du Bose; Adah M. Pendleton; Elizabeth M. Hewitt; Della V. Knight; Josephine Beatrice Bowman; Lenah H. Sutcliffe Higbee; Esther Voorhees Hasson, the first Superintendent of the Navy Nurse Corps, 1908–1911; Martha E. Pringle; Elizabeth J. Wells; Clare L. De Ceu.; Elizabeth Leonhardt; Estelle Hine; Ethel R. Parsons; Florence T. Milburn; Boniface T. Small; Victoria White; Isabelle Rose Roy; Margaret D. Murray; Sara B. Myer; and Sara M. Cox. The Nurse Corps gradually expanded to 160 on the eve of World War I. For a few months in 1913, Navy nurses saw their first shipboard service, aboard Mayflower and Dolphin.