SEC. 25, ART. 18 = after the expiration in 1991 of the agreement between the Republic of the PH and US concerning military bases, foreign military bases, troops, or facilities, shall not be allowed in the PH except under a treaty duly concurred in by the Senate, and when the Congress requires, ratified by a majority of votes cast by people in national referendum held for that purpose, and recognized as a treaty by the other contracting state