Thank you. I am not a scientist but I did read and try to absorb as much as I could. And I have no argument that "hot spots" should be cleaned up. I spent a year in Vietnam at Bien Hoa which is considered one of the hot spots. I was also aware of the study in Seveso that shows palatel defects in some infants after many years of study. This information on AO also is given by the National Institute of Cancer of whom you cite above:
http://voteview.com/Dioxin_Summary.pdf
Now, the Ministry of Health in Vietnam is claiming 400,000 deaths, and millions of birth defects (its easy to find some horrible photos of these unfortunate victims on the net) due to Agent Orange. My beef is that I believe most of these birth defects and cancers are being caused by industrial polution. As you state most of the high levels are at the "Hot Spots. Normally the large air bases in Vietnam. Unlikely places for civilians to be before or after the war, except in small numbers. One only need to look at what happened and is happening in China when it comes to birth defects and industrial polution. Is the US responsible for millions of birth defects or are the Vietnamese scapgoating for their own puposes?