Agent Orange victims are seen at a hospice in Vietnam's central Da Nang City June 16, 2011. The U.S. and Vietnam launched the first concrete step towards cleaning up contamination from Agent Orange on Friday, in what the top U.S. diplomat in the country said was one of the most significant developments ever in bilateral ties. Agent Orange was a dioxin-laced defoliant sprayed by U.S. troops in the Vietnam War to destroy crops and jungle cover shielding guerrillas. [Photo/Agencies] 

Agent Orange victims clap during a lesson at a hospice in Vietnam's central Da Nang City June 16, 2011. The U.S. and Vietnam launched the first concrete step toward cleaning up contamination from Agent Orange on Friday, in what the top U.S. diplomat in the country said was one of the most significant developments ever in bilateral ties. Agent Orange was a dioxin-laced defoliant sprayed by U.S. troops in the Vietnam War to destroy crops and jungle cover shielding guerrillas. Picture taken June 16, 2011. [Photo/Agencies]