The Mikoyan-Gurevich MiG-25 is a supersonic interceptor and reconnaissance aircraft that is among the fastest military aircraft to enter service. Designed by the Soviet Union's Mikoyan-Gurevich bureau, it is one of the few combat aircraft built primarily using stainless steel. The design of the MiG-25 was directed entirely at achieving high speed and high altitude. Conceived to intercept the North American B-70 Valkyrie Mach 3 Bomber, the Mikoyan-Gurevich MiG-25 (NATO reporting name: Foxbat) supersonic interceptor is still among the fastest military aircraft to have ever entered service.with high-altitude, supersonic bombers, the MiG-25 was designed about 1960. As introduced in 1970, this twin-engine interceptor, the fastest combat aircraft ever in active service, registered speeds of Mach 2.7 and 2.8, with an operational ceiling above 24,400 m (80,000 feet).