Given responsibility for the I Corps Tactical Zone in 1967, Lãm coordinated the South Vietnamese offensive known as Operation Lam Sơn 719 which aimed at striking the North Vietnamese logistical corridor known as the Hồ Chí Minh Trail in southeastern Laos during 1971.
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The most damaging testimony for the Army's program came from the commander of the Air Force's Tactical Air Command, General William W. Momyer, who cited helicopter casualty statistics of Operation Lam Son 719.