Trying to research to where he was stationed but it's going to take some time.
All I know was the place was like a desert...they wiped out the vegitation with agent orange.
I watched another farmer I know dump it just about straight in a field infested with dock and chickweed. It dropped the stuff in an hour. It causes a form of cancer in plants by stretching and deforming the cells. It is made by the same Japanese company that makes "Roundup" which is another form of it. They never banned the stuff. Just changed its name. I want nothing to do with it and rather hack the dock out before it seeds or burn it after it does. I feel the same way you do about the health effects. I was so scared when my horse farrier Terry, who was a marine in Nam started getting sick after he got older that I put cigarettes down and never picked them up again. I thought they might trigger something that was passed from my father. This thread also has me thinking a lot when my mother sister and I came home from shoping that day and found him.
'Military.com' might be able to help you with his info. If you have the info from his DD214 you can sign on and use that to get the rest. You can also contact some of his old buddies through that site if they use it or are registered.