Operation Tiger Hound was a covert U.S. 2nd Air Division, later Seventh Air Force and U.S. Navy Task Force 77 aerial interdiction campaign conducted in southeastern Laos from 5 December 1965 till 11 November 1968, during the Vietnam War. The purpose of the operation was to interdict the flow of People's Army of Vietnam (PAVN) supplies on the Ho Chi Minh Trail from the Democratic Republic of Vietnam, through southeastern Laos, and into the northern provinces of the Republic of Vietnam. The missions were originally controlled by the 2d Air Division until that headquarters was superseded by the Seventh Air Force on 1 April 1966.