The YF-12 was a twin-seat version of the secret single seat Lockheed A-12 reconnaissance aircraft operated by the CIA. Unlike the A-12, it was furnished with fire-control radar and could be armed with air-to-air missiles. It set and held speed and altitude world records of over 2,000 miles per hour and over 80,000 feet until surpassed by the SR-71 Blackbird.