Seniors

possible. Unfortunately we don't have a good data base for South Pacific inhabitants. Unless of course they migrated at some point to the US. Which is possible. I suggest you test at Ancestry.com which at this point has the largest DNA data base. You will get a long list of people you DNA match. Look for matches with South Pacific heritage. If you are looking for half sibs, they will be at the top of your match list.

But unfortunately at this point, we just do not have large DNA samples from South Pacific Islanders, or those from the Philippines, Taiwan, etc.

I do believe at some point, we will have an Asian data base. China is said to be testing its citizens, but we cannot get our hands on that info as of yet.

But I have seen first hand the results of sailors on shore leave. I visited Shanghai China, which has been a major international shipping port since 1842. The women there are very beautiful, the best looking women in China I believe.
I am sure gorgeous women from all over China came to Shanghai to earn a living. And to my eye, some of the inhabitants of Shanghai have a semblance of European DNA, which is not the case in other parts of China.

I also traveled to Guangzhou China, which is on the border of North Viet Nam. I had a lengthy layover in the airport there and noticed obvious European facial traits in some of the clearly Chinese citizens there. They were about the right age for offspring of Viet Nam era vets.

I also have taken cases where US soldiers fathered children in Britain during WWII. Which is not uncommon.
It is such fascinating work. The DNA doesn't lie. And tells the story.