The Lockheed SR-71 was a twin-engine stealth reconnaissance aircraft (SR = Strategic Reconnaissance) developed by Skunk Works, the secretive Advanced Development Projects Unit of Lockheed Martin for the CIA, and was in service with the U.S. Air Force from 1966 to 1998. Known as the Blackbird, this reconnaissance aircraft achieved speeds of Mach 3 and above, as well as altitudes of 24 km, flying faster and higher than any surface-to-air missile, which meant that no aircraft was ever shot down during its reconnaissance missions over enemy territory. The high speeds required the special and very expensive fuel JP-7, the highly complex stealth technology, and the concurrently advanced satellite technology negatively impacted the program, leading to its end in 1998. Of the 32 SR-71s produced, 12 were lost in accidents. The aircraft that were in the possession of the USAF at the end of the program were all handed over to museums. The SR-71 still holds various speed records. Model with 1,374 parts, 1 figure, printed blocks, and movable elements. Model dimensions (LxWxH): 37.5 x 33.5 x 12.5 cm.