The island was part of the Manila and Subic Bay Harbor Defense Command.
Fort Drum, cage-mast erection, El Fraile Island from CDSG
Fort Drum Construction, El Fraile Island from CDSG,
Fort Drum Construction, El Fraile Island from CDSG, SW View.
Plan to install 16 inch guns on Monja Island. From Tony Feredo.
Fort Drum Construction, Fraile Island from CSDG, North View
