Whilst the single most overwhelming image of the Vietnam War remains that of the helicopter, there can be little doubt concerning the massive contribution made by fixed-wing aircraft of the US Army, USMC and USAF. The aerial battlefield of South Vietnam was so completely dominated by the United States that they had total and uncontested air supremacy - there is no record of air interdiction of communist aircraft in the skies over South Vietnam. With this supremacy came a freedom of operations rarely seen in modern warfare and the United States unleashed an unprecedented air campaign against the forces of the NVA and Viet Cong in the South. Wherever and whenever US ground troops required air support, it was forthcoming on a massive and almost unlimited scale and in spite of increasingly sophisticated anti-air tactics, the enemy was invariably forced to resort to the simple expedient of 'hugging the belt' of the Allied forces in order to avoid the overwhelming firepower that could be brought to bear from US fixed-wing aircraft.
Enzo Angelucci, The American Combat Aircraft and Helicopters of the Vietnam War, Blandford Press
See Also: Tactical Air Support