US Naval Advance Bases were built globally by the United States Navy during World War II to support and project U.S. naval operations world-wide. A few were built on allied soil, but most were captured enemy facilities or completely new. Advance bases provided the fleet with support to keep ships tactically available with repair and supply depots of facilities, rather than return them to continental United States. Before Japan declared war on the United States the US Navy had a single fleet sized advanced base in the Territory of Hawaii. It was Naval Station Pearl Harbor. During the war the US Navy Seabees built over 400 advance bases categorized by size. Naval bases were either Lions or Cubs while airfields were either Oaks or Acorns. Lions and Oaks were major facilities while Cubs and Ac