In some of the heaviest raids of the war, 150 U.S. Air Force and Navy planes launch Operation Tiger Hound to interdict the Ho Chi Minh Trail in the lower portion of the Laotian panhandle, from Route 9 west of the Demilitarized Zone, south to the Cambodian border.
The purpose of this operation, which lasted until 1968, was to reduce North Vietnamese infiltration down the trail into South Vietnam. After 1968, the Tiger Hound missions became part of a new operation called Commando Hunt.
