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In December 1972, the Air Defence-Air Force played a crucial role in defeating the strategic bombing raid by B-52 bombers of US imperialists. This victory, known as “Hanoi – Dien Bien Phu in the air,” forced the US to sign the Paris Peace Accords on ending the war on January 27, 1973, paving the way for the complete liberation of the South of Vietnam and national reunification.