In 1991 Congress mandated a series of studies every two years for 10 years examining the effects of herbicides, such as Agent Orange, that were used in Vietnam.
Additional research is needed to shed more light on the issue.
The scientists estimate that Agent Orange spraying may have increased the risk of AML in veteran's children by 70 to 300 percent. The other, a study of what illnesses children of Australian Vietnam veterans had been diagnosed with, found a greater than four-fold risk although most confounding factors were not controlled for.