South Vietnamese forces follow after terrified children, including 9-year-old Kim Phuc, center, as they run down Route 1 near Trang Bang after an aerial napalm attack on suspected Viet Cong hiding places, June 8, 1972. A South Vietnamese plane accidentally dropped its flaming napalm on South Vietnamese troops and civilians. The terrified girl had ripped off her burning clothes while fleeing. The children from left to right are: Phan Thanh Tam, younger brother of Kim Phuc, who lost an eye, Phan Thanh Phouc, youngest brother of Kim Phuc, Kim Phuc, and Kim's cousins Ho Van Bon, and Ho Thi Ting. Behind them are soldiers of the Vietnam Army 25th Division. (Photo by Nick Ut/AP Photo)





In this August 19, 1965, file photo, made by Peter Arnett, a U.S. Marine who was wounded in the head as he fought against the Viet Cong from inside an amphibious tank, is led to an evacuation helicopter landing zone at Van Tuong, Vietnam. (Photo by Peter Arnett/AP Photo)





Two troopers of the U.S. 4th Infantry Division carry a wounded soldier out of the line of North Vietnamese fire to a protective bunker on Hill 990 in South Vietnam's Central Highlands, June 2, 1968. The troops were under enemy siege and were unable to evacuate their wounded or dead comrades. (Photo by Rick Merron/AP Photo)





Bombs with a mixture of napalm and white phosphorus jelly dropped by Vietnamese AF Skyraider bombers explode across Route-1, amidst homes and in front of the Cao Dai temple in the outskirts of Trang Bang, June 8, 1972. In the foreground are Vietnamese soldiers and news and cameramen from various international news organizations who watch the scene. The towers of the Trang Bang Cao Dai temple are visible in the centre of the explosions. (Photo by Nick Ut/AP Photo)





A Vietnamese girl, her parents slain in a ferocious Viet Cong attack on Dong Xoai, sits with her personal belongings on a mud wall of the village, staring into the jungle after the fight subsided, June 10, 1965. A Vietnamese soldier stands guard in the background. (Photo by Horst Faas/AP Photo)





An American soldier, right, is positioned over his rifle as he protects his wounded buddy crouched in front of a log in the thick mud during battle against North Vietnamese in War Zone D near Phuoc Vinh, Vietnam, June 15, 1967. The B Company of the 1st Battalion, 16th Infantry, 1st Division fought a 30-minute battle and lost 6 men with 12 wounded. Another marine can be seen behind the log. (Photo by Henri Huet/AP Photo)





Medic James E. Callahan of Pittsfield, Mass., gives mouth-to-mouth resuscitation to a dying soldier in war zone D, about 50 miles northeast of Saigon, June 17, 1967. Thirty-one men of the 1st Infantry Division were reported killed in the guerrilla ambush, with more than 100 wounded. (Photo by Henri Huet/AP Photo)





Special Forces Green beret troopers watch ammo cases dangling from parachutes come down into their drop zone. The green berets are manning the Special Forces camp in Dak Seang 320 miles North of Saigon, June 20, 1968. As the landing strip at the camp is not big enough to take the big C-130 transport planes parachute drops are made to avoid helicopters making trips back and forth to Dak to 20 miles away. (Photo by AP Photo/Holloway)





United States Army helicopters land in tight landing formation, near Phouc Vinh, war zone D, South Vietnam, June 20, 1967, during an operation launched by the US Army's 1st Division. (Photo by AP Photo)





A Vietnamese woman and her children crouch in a hole at the edge of a battlefield 15 miles northeast of Toy Hoa, where a battalion of the U.S. 1st Brigade, 101st Airborne Division, reinforced by the 1st Cavalry, was defending its jungle hilltop positions against an estimated regiment of North Vietnamese regulars, June 22, 1966. Most civilians had taken cover during during several days of fighting. A U.S. soldier had given this family a C-ration in the tin can, while the hat under it once belonged to a North Vietnamese soldier. (Photo by Henri Huet/AP Photo)





A South Vietnamese soldier holds a wounded boy who is the only surviving member of his family after North Vietnamese opened fired on a group of refugees fleeing south from An Loc along Route 13 on June 22, 1972. (Photo by AP Photo)





A U.S. soldier, carrying a portrait of himself and his girlfriend, walks across the Phu Bai Air Base, June 27, 1972, as he starts his trip back to the United States. Most of his unit, the 196th Brigade, is being returned to the U.S. (Photo by Peter Winterbach/AP Photo)





South Vietnamese soldiers prepare to load Chinese-made recoilless rifles aboard a waiting helicopter in Cambodia, 85 miles northeast of Phnom Penh, on May 25, 1970. The weapons were captured as the troops advanced down route seven toward the Chup rubber plantation. (Photo by Nick Ut/AP Photo)





A U.S. GI grimaces as down blast from a helicopter in background kicks up dust around his face. He was part of a detail of men from Charlie Company of the 101st airborne protecting a landing zone for the chopper that served as a resupply link for the men, who were probing a North Vietnamese staging area, May 25, 1971. (Photo by AP Photo)





Seeing his first action since landing in Vietnam, a U.S. paratrooper of the 1st Battalion, 173rd Airborne, looks over his shoulder while leading his unit uphill against Viet Cong snipers near Vung Tau, May 26, 1965. The snipers eventually withdrew. (Photo by Horst Faas/AP Photo)





Paratroopers of the 173rd U.S. Airborne Brigade scurry through South Vietnam field after landing from helicopter near Saigon on May 31, 1965. The brigade launched its first major operational exercise but no major contact with the Viet Cong was reported. (Photo by Horst Faas/AP Photo)





Residents rush to leave a threatened section of Cholon, the Chinese quarter of Saigon on June 1, 1968. Vietcong units moved into the area by passing Vietnamese Marines fighting to the west and fired on government troops. Reacting instinctively, residents picked up their personal belongings, abandoned their homes, and fled. (Photo by Eddie Adams/AP Photo)