EXCLUDING FROM THE OPERATION OF PROCLAMATION NO. 423, DATED JULY 12, 1957, WHICH ESTABLISHED THE MILITARY RESERVATION KNOWN AS FORT WILLIAM MCKINLEY (NOW FORT BONIFACIO) SITUATED IN THE MUNICIPALITIES OF PASIG, TAGUIG, PARAÑAQUE, PATEROS, PROVINCE OF RIZAL, AND PASAY CITY, A CERTAIN PORTION OF THE LAND EMBRACED THEREIN SITUATED IN THE MUNICIPALITY OF PATEROS AND DECLARING THE SAME OPEN TO DISPOSITION UNDER THE PROVISIONS OF ACT 3038 IN RELATION TO THE PROVISIONS OF THE PUBLIC LAND ACT