The Cold War was a unique period of world history. The fierce confrontation between the USSR and the USA led to the birth of many unique aircraft used in specialized missions, one of which was the high-altitude supersonic reconnaissance aircraft of the US Air Force, SR-71, nicknamed the Blackbird. This aircraft, created in the '60s, was practically invulnerable to interception by both ground and air defense systems as it could develop an outstanding speed of over Mach 3.0 at an altitude of over 22,000 meters.