For three years, the US dropped 900,000 tons of bombs on North Vietnam to break its will to fight. North Vietnam rebuilt every bridge, kept every supply line open, and fought on.
Operation Rolling Thunder began on March 2, 1965, as a graduated bombing campaign against North Vietnam — a strategy designed to signal American resolve while giving Hanoi a chance to back down before suffering unacceptable damage. The campaign would run for three years and eight months. President Johnson personally approved individual bombing targets from a list he reviewed at Tuesday lunch meetings in the White House, micromanaging the air war down to specific bridges and fuel depots.
The restrictions built into Rolling Thunder reflected the fear of repeating Korea — of bombing a Communist neighbor into direct intervention by China or the Soviet Union. Pilots were forbidden to strike within 30 miles of Hanoi and 10 miles of the port of Haiphong. They could not attack airfields where North Vietnamese MiGs sat in plain sight. They were sometimes required to give advance warning of strikes. Military commanders found the restrictions maddening.
North Vietnam's response was a masterclass in adaptation. Industries were dispersed across the countryside so no single strike could cripple production. Roads were repaired within hours by civilian work brigades. Bridges were replaced by underwater fords and floating pontoons. Supply convoys moved at night. An estimated 300,000 civilian laborers worked full-time keeping transportation routes open. The North Vietnamese called their resilience 'the will to win.'
The air war produced massive American aircraft losses. Over three years, the US lost approximately 922 aircraft to North Vietnamese air defenses — Soviet-supplied surface-to-air missiles, radar-guided anti-aircraft artillery, and MiG fighter interceptors. American pilots who survived being shot down were captured and held in North Vietnamese prisons, enduring years of brutal treatment that became the defining ordeal of the war for many Americans at home.
The bombing's strategic logic rested on an economic pressure theory: destroy enough infrastructure, and North Vietnam would be forced to divert resources from supporting the war in the South. The theory ignored the fact that North Vietnam was a primarily agricultural economy with relatively little industrial infrastructure to destroy, and that its main ally — the Soviet Union — was willing to replace whatever the bombs destroyed, faster than they could be bombed again.
By 1968, Rolling Thunder had dropped more bomb tonnage on North Vietnam than the entire Allied bombing campaign against Germany in World War II. North Vietnam's transportation network remained functioning. The flow of men and supplies to the South continued. The Ho Chi Minh Trail, the main supply artery, had never been severed. President Johnson halted the campaign in November 1968, hoping to restart peace negotiations. It had cost the United States over $6 billion and achieved none of its strategic objectives.