South Vietnam-Operation of the US Marines and bombers in the area of Hue. South Vietnam-Evacuation of wounded Americans after an attack by South Vietnamese patriots near the Cambodian border, American patrols in the jungle. DRV and South Vietnam-Planes from the US aircraft carrier "Hancock" bomb military facilities, shooting from the air. South Vietnam and the DRV-US aircraft fire and drop missiles over South Vietnam, bomb bridges in the DRV. South Vietnam-The U.S. Marine Corps uses sniffer dogs to track down guerrillas. South Vietnam-The American "air police" guarding the air base in Tan Son Nhut. South Vietnam-Hospital, wounded residents of the village of Truong Thanh, which was attacked by American bombers. South Vietnam-American planes spray chemicals to destroy crops, an American plane with bullet marks.