The Sihanouk Trail was a logistical supply system in Cambodia used by the People's Army of Vietnam (PAVN) and its National Front for the Liberation of South Vietnam (NLF, or Viet Cong) allies during the Vietnam War (1960–1975). Between 1966 and 1970, this system operated in the same manner and served the same purposes as the much better known Ho Chi Minh Trail (the Truong Son Road to the North Vietnamese) which ran through the southeastern portion of the Kingdom of Laos. The name is of American derivation, since the North Vietnamese considered the system integral to the supply route mentioned above. U.S. attempts to interdict this system began in 1969.