Funny that so many people experience bad vibes with this individual,who, I am sure, is the salt of the earth, and a pillow of society.
Personally, he has such an adverse effect on me. that I did as Billie suggests, that is, I listed him as deceased, and have refused to open anything with his Good Old Mr. Wilson logo, for a long time now.
But back to your original request for information:
Do you by chance have your dad's discharge papers ? These would provide a lot of material which will make it at least a little easier to trace his travels.
For instance, if we have the dates he left the US, arrived in Europe, traveled back to the US and dates he departed for the Pacific and returned to the US, we will be able to zero in on his unit in the Pacific.
The discharge will also list the various campaigns he participated in, which will pin point his areas of operation.
Let me know how I may assist you, without charge, of course.