Original Ranger portraits are quite hard to find IMO but the 6th is probably the hardest. A friend of mine found this for me in an Antique shop in VA last weekend.
No luck identifying him so far. He signed the photo as "Buddy"
Photo was most likely taken in Japan during the occupation. Japanese hand written on the reverse looks like ツーポーン which phonetically spells out "TUPON". It is written in Katakana which is used to spell out foreign words so it could be a last name but who knows. I looked at the name list of those who participated in the Cabanatuan raid but nothing similar to this on it.
He seems to be wearing the Philippine Liberation ribbon.