Many versions of the famous MiG-21 fighter (especially .second and third generation") are still in service in many former .east block" air forces and .third world" air forces. This demonstrates the well-known qualities of the fighter, the development of which began about thirty years ago. They were the backbone fighters for their users in sixties and seventies. It has still its own position in these air forces today and it is possible it will not be abandoned in the near future. The Mikoyan and Gurevich OKB (experimental aircraft construction bureau) was (and still is) the main "supplier" of fighters to Soviet Army Air Force (V-VS USSR). It's goal was to develop a real new lightweight fighter - interceptor with speeds above M-2. The new fighter had to have the highest possible air combat performance and maneuvrability and it had to be simple and cheap to maintain and repair, to be able to operate from the front-line or roughly prepared airstrips...