Nguyen Thi Ly, 11, skips rope in her village south of Da Nang, Vietnam. Her grandfather served in the North Vietnamese Army during the Vietnam War, and she is a third generation victim of dioxin exposure, the result of the U.S. military's use of Agent Orange and other herbicides during the conflict more than 40 years ago. The Vietnam Red Cross estimates that 3 million Vietnamese suffer from illnesses related to dioxin exposure, including at least 150,000 people born with severe birth defects since the end of the war. U.S. officials still deny that dioxin is to blame for widespread health problems in Vietnam.