<P> Naval Base Subic Bay was a major ship - repair , supply , and rest and recreation facility of the Spanish Navy and subsequently the United States Navy located in Zambales , Philippines . The base was 262 square miles , about the size of Singapore . The Navy Exchange had the largest volume of sales of any exchange in the world , and the Naval Supply Depot handled the largest volume of fuel oil of any navy facility in the world . The naval base was the largest overseas military installation of the United States Armed Forces after Clark Air Base in Angeles City was closed in 1991 . Following its closure in 1992 , it was transformed into the Subic Bay Freeport Zone by the Philippine government . </P>
in the early 1990s the united states closed clark air force base and subic bay naval station in
Zambales , Philippines