The Air War between the Vietnamese People's Air Force (VNPAF) and the United States lasted nearly eight years, with hundreds of thousands of combat missions carried out and nearly four hundred dogfights. Combat in the Sky: Airpower and the Defense of North Vietnam, 1965-1973, is the English edition of the definitive North Vietnamese work on Vietnam War airpower. Here, Dong Sy Hang depicts the relevant events in chronological order from the first air battles to the VNPAF's attacks on Tân Son Nhat Airfield (April 1975). The air war in Vietnam was the first modern conflict in which the two opposing sides used jet-powered aircraft equipped with air-to-air missiles. In addition to his analysis of the strategic calculations, especially by the North Vietnamese, and the operations carried out, the author also details the technical characteristics of the weaponry used, as well as the changes in tactics applied in each phase of the war. Dong provides the most unique perspective of this aspect of the conflict available in the English language.