About the book: 2000 / In July 1965, the Americans first noted the use of S-75 anti-aircraft missile systems in the north of Vietnam by the Tsami, as it became It is known later that the air defense systems were serviced by Soviet crews. The new air defense system turned out to be an effective weapon for combating air targets at medium and high altitudes. American aviation was forced to descend to the very ground, where US Air Force and Navy aircraft became vulnerable to attacks by MiG-17 fighters of the DRV Air Force. By the end of the year, the intensity of the air war sharply escalated; in addition to the MiG-17, supersonic MiG-21F-13 fighters equipped with air-to-air missiles began to appear in the air. In April 1966, the MiG-21 PF interceptors entered service with the DRV Air Force. Note: A complete set of illustrations, arranged as in a printed publication, captions for illustrations in text.