A little here on Palmer. It appears some of the details are not correct.
http://vetaffairs.sd.gov/sdwwiimemor...lay.asp?P=1460
The information came from a half-sister who died just last year. (Possibly the same father as Eugene.)
[url]https://www.legacy.com/obituaries/argusleader/obituary.aspx?page=lifestory&pid=186191489[/url
You can probably track down some of the sons mentioned in the obit and get leads on any other possible relatives.