The island was part of the Manila and Subic Bay Harbor Defense Command.
Two Turret Bases, Fort Drum Construction, Fraile Island from CSDG.
Turret Pan, Fort Drum Construction, Fraile Island from CSDG.
La Monja Island, Manila Bay off Mariveles Harbor, from CSDG
El Fraile Island, pre Fort Drum Construction, from CSDG.
