Tran Thi Ty Na, 33, sits on bed in her family's home in Da Nang, Vietnam, with her mother, Hoang Thi Te, 75, in the background. Na and her older brother are second-generation victims of dioxin exposure, the result of the U.S. military's use of Agent Orange and other herbicides during the Vietnam War more than 40 years ago. Na's father, who served as a soldier during the conflict, died years ago from illnesses caused by Agent Orange. Her mother and aunt are now the sole caregivers for herself and her older brother, who is mentally and physically disabled because of their father's exposure. Na has developed muscular dystrophy and other conditions like her brother and is angry at the cruel fate that awaits her. The family gets no government support, and Te, the mother, wonders who will take care of her children when she is gone. March 18, 2013.