Military Prisoner of War Camp #10-D
Pampanga Province

PHILIPPINES to WASHINGTON

I did some research on 10D today. Attached is a page I  found in a book called "From Wake Island to Berlin , WWII Ex-POW's". Each chapter is a POWs story. 

In the book I found a picture of another 10D card! It appears the POW, Charles Branum, was held at Neilson Field and a "Filipino Army Airbase". In late 1943 he was sent to Japan. The card must be from one of those 2 locations, possibly Neilson . It makes sense since camp 10C was Clark Field. At least we are narrowing the possibilities down.

According to Kurt the other possible location is Zablon (Air) Field.