Operation Linebacker, 1972

found: Work cat.: Mine warfare operations files ..., 1972 May 9-1973 Jan. 14:(military records relating to Operation Linebacker ... involving mining operations conducted against North Vietnamese interior waterways and harbors during 1972; objective was to block interior waterways and to prevent the construction of bridges over the waterways)

found: Virtual Vietnam Archives operations search, Mar. 10, 2008:(Operation Linebacker I; carried out from May 10, 1972, to Oct. 23, 1972; Linebacker I began with the mining of the Haiphong harbor, as well as other North Vietnamese ports; Linebacker I succeeded where Rolling Thunder failed; USAF F-4 Phantoms attacked Long Bien Bridge and the Yen Vien railroad yard in Ha Noi ... strikes then moved on to destroy bridges, tunnels, and railroads leading to China)

found: Adkins, P. Codeword dictionary, 1997: (Linebacker or Linebacker I; began May 1971; American air attacks on North Vietnamese transportation, power and supply facilities; attacks ended on Oct. 23, 1972; followed by Linebacker II ... ordered by President Nixon on Dec. 18, 1972 to force N. Vietnamese back to peace negotiations)