1945 Luzon, Philippines inter-island U.S. Navy Base 25 cover July 25, 1945 Cover posted at Naval Service Detachment, Division 25; Base 25, Santo Tomas, Luzon, U.S. Commonwealth of the Philippines. "inter Island" marking at upper right would indicate that it was carried to another location on Luzon. What's interesting about this cover is the naval censor marking. One of the few inter-island cover during the WWII era.