Thanks for pointing this out! I believe the style does show way more differences than similarities though...
And Ian is correct, the ferrule isn't what point to the Philippines but maybe Chinese or Vietnam like the base of the blade. This base style you can find by Chinese daggers. So maybe indeed Vietnam?
Mind you, it could be from any of the many, many China towns scattered all over SE Asia; it's just a matter of probabilities and my 3 suggestions would fit into the period (certainly several more possibilities within Southern Vietnam though depending on where the GI was stationed).