In the meantime, revised Soviet Air Force requirements called for a low-altitude strike aircraft with STOL capability. The aircraft was supposed to represent a modification of the Sukhoi Su-15 interceptor (factory designation S-58). The mockup was inspected but no further work was ordered due to lack of progress on the Puma hardware. It designed and built a mockup of S-6, a delta wing aircraft powered by two Tumansky R-21 turbojet engines and with a crew of two in a tandem arrangement. In 1962–1963, Sukhoi initially set out to build an aircraft without the complexity of moving wings like the F-111. The resulting F-111 would introduce a variable-geometry wing for greatly increased payload, range, and low-level penetration capabilities. That same year, the United States proposal for their new all-weather strike fighter would be the TFX. OKB-794 (later known as Leninets) was tasked with developing an advanced nav/attack system, codenamed Puma, which would be at the core of the new aircraft. Preliminary investigations with S-28 and S-32 aircraft revealed that the basic Su-7 design was too small to contain all the avionics required for the mission. One of the conditions for accepting the Sukhoi Su-7B into service in 1961 was the requirement for Sukhoi to develop an all-weather variant capable of precision air strikes. It remains in service with the Russian Aerospace Forces, Syrian Air Force, Ukrainian Air Force, Algerian Air Force and various other air forces to which it was exported. The Su-24 started development in the early 1960s and entered full production in 1967. It was the first of the USSR's aircraft to carry an integrated digital navigation/attack system. The aircraft has a variable-sweep wing, twin-engines and a side-by-side seating arrangement for its crew of two. The Sukhoi Su-24 ( NATO reporting name: Fencer) is a supersonic, all-weather tactical bomber developed in the Soviet Union.
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