The Sukhoi Su-17 (izdeliye S-32) is a variable-sweep wing fighter-bomber developed for the Soviet military. Its NATO reporting name is "Fitter". Developed from the Sukhoi Su-7, the Su-17 was the first variable-sweep wing aircraft to enter Soviet service. Two subsequent Sukhoi aircraft, the Su-20 and Su-22, have usually been regarded as variants of the Su-17. The Su-17/20/22 series has had a long career and has been operated by many other air forces of including the Russian Federation, other former Soviet republics, the former Warsaw Pact, countries in the Arab world, Angola and Peru. Development Shortly after the Su-7 fighter-bomber was put into service, the Sukhoi Design Bureau was ordered to develop a deep modernization program for the aircraft in the early 1960s. The program would be aimed primarily at updating on-board avionics and the takeoff/landing performance characteristics. The concept of variable-geometry wings - something gaining wider attention at that time - was adopted as well. The program was to be led by Sukhoi's head designer, Nikolay Zyrin. Seeking to improve low-speed and take-off/landing performance of the Su-7B fighter-bomber, in 1963 the Sukhoi OKB with input from TsAGI created a variable-sweep wing technology demonstrator. The S-22I (also known as the Su-7IG, NATO designation "Fitter-B"), converted from a production Su-7BM, had fixed inner portions of the wing with movable outer segments which could be swept to 28°, 45°, or 62°. The S-22I first took off, with Vladimir Ilyushin at the controls on 2 August 1966. It was later publicly demonstrated to the public at the air parade in Domodedovo in July 1967. Flight testing revealed that the new configuration improved both the take-off/landing characteristics and the range and endurance of the aircraft. Handling was also generally better than the fixed wing Su-7, with the exception that there was no longer any buffeting at high angles of attack to warn of imminent stall. The aircraft was ordered into serial production in 1969 by a joint resolution of the Central Committee of the Communist Party of the Soviet Union and the Council of Ministers. The design of the Su-7IG was modified further, eventually with enough difference to justify the S-32 internal designation. The S-32 first took off on July 1, 1969, with Yevgeny Kukushev at the controls. Serial production of the Su-17 started at the Yuri Gagarin Aviation Factory (now KnAAPO) in 1969. The 523rd Aviation Regiment, of the Far East Military Okrug, was