Most are dead, if you want to find.
As for the POWs, most likely you won't find them in SG anymore,
they should be back home. And if they are alive to this
date...
Try reading the LKY book...
Also, if you want pictures, try Serangoon. I know this area got
some tombs or something. Don't know, go to Peicai Sec and ask for
help. They organized a tour around this area before.