In 1915, the Headquarters of the 5th Naval District. In April 1917, shortly after the United States entered World War I. The Naval Operating Base (NOB) and other facilities were established. By 1918, there were 34,000 enlisted men at the base. However, by the war’s end, the base was reduced in personnel and put into a standby mode. STAND IS FOR PICTURE AND LISTING PURPOSE AND IS NOT INCLUDED IN THE SALE. SIGNATURE CONFIRMATION REQUIRED AND INSURED.