An Agent Orange victim carries food for lunch 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

Teacher Nguyen Ngoc Phuong (C), 31, an Agent Orange victim, walks among other victims during a lesson at a hospice in Vietnam's 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

A soldier detects Unexploded Ordnance (UXO) and defoliant Agent Orange at a presentation during the launch of the "Environmental Remediation of Dioxin Contamination" project in Vietnam's central Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

Soldiers take a rest at a camp after a presentation on detecting Unexploded Ordnance (UXO) and defoliant Agent Orange during the launch of the "Environmental Remediation of Dioxin Contamination" project in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

An Agent Orange victim learns to use the sewing machine at a vocational class in 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

Agent Orange victims are seen at a classroom of 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

Soldiers in protective gear detect Unexploded Ordnance (UXO) and defoliant Agent Orange at a presentation during the launch of the "Environmental Remediation of Dioxin Contamination" project at the airport in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

Agent Orange victim Tran Thanh Ngoc Tran (R), 35, whose father served in the U.S.-backed South Vietnam military during the Vietnam War, is seen at her house in Vietnam's 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

A lake near the airport which has been contaminated by the defoliant Agent Orange, is pictured in Vietnam's 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAMPOLITICS ENVIRONMENT - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

Soldiers in protective gear are pictured after a presentation on detecting Unexploded Ordnance (UXO) and defoliant Agent Orange during the launch of the "Environmental Remediation of Dioxin Contamination Project" in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

Vietnam's Airforce deputy commander General Do Minh Tuan (R) and U.S. embassy Charge D'Affairs Virginia Palmer (2nd L) cut the ribbon during the launch of the "Environmental Remediation of Dioxin Contamination" project in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

Soldiers attend the launch of the "Environmental Remediation of Dioxin Contamination" project in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

Agent Orange victim Tran Van Bao (R), 18, is pictured holding a piece of paper as a mobile phone to make a call at a hospice in Vietnam's 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. Picture taken June 16, 2011. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT CONFLICT) 

The U.S. embassy Charge d'Affaires Virginia Palmer (R) watches as a soldier detects Unexploded Ordnance (UXO) and defoliant Agent Orange at a presentation during the launch to kick off the "Environmental Remediation of Dioxin Contamination" project in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

Vietnam's Airforce deputy commander General Do Minh Tuan (L), U.S. embassy Charge d'Affaires Virginia Palmer (2nd R) and USAID Mission Director in Vietnam Francis Donovan (R), raise their glasses for a toast during the launch of the "Environmental Remediation of Dioxin Contamination" project in Vietnam's Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT) 

Soldiers detect Unexploded Ordnance (UXO) and defoliant Agent Orange during the launch of the "environmental remediation of dioxin contamination" project, in Vietnam's central Da Nang City June 17, 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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS ENVIRONMENT MILITARY CONFLICT IMAGES OF THE DAY) 

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. REUTERS/Kham (VIETNAM - Tags: HEALTH POLITICS CONFLICT ENVIRONMENT)