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Su-24 (Fencer) is a Soviet jet bomber with variable-geometry wings.
The aircraft was supposed to be a response to the American F-111, and therefore it's structurally similar.
Su-24 can operate in any weather conditions, also at night.
It was designed to carry tactical nuclear weapons. In the 1960s, the military command of the Soviet Union set requirements for a new attack aircraft that would be able to operate despite strong ant-aircraft defense of NATO troops.
An aircraft was expected to fly on a very low altitude at a very high speed.
Initially, it was based on Su-7 and Su-15 airframes, but due to the decision to use variable-geometry wing, it was necessary to build a completely new structure.
Variable geometry allowed to achieve high speeds while maintaining good takeoff and landing characteristics.
This is how Su-24 was born. The first prototype was flown on July 2, 1967 (marked as T6-1), and the second on January 17, 1970 (T6-2I).
Variable-geometry wings were only used in the second prototype.
In December 1971, the first serial Su-24 was built, but due to the prolonged acceptance tests (lasting until 1974), the aircraft officially did not become operational until February 1975.
Su-24 was named Fencer in the NATO code.