The Lockheed SR-71 "Blackbird" was an advanced, long-range, Mach 3+ cardinal assay aircraft. It was developed as a atramentous activity from the Lockheed A-12 assay aircraft in the 1960s by the Lockheed Skunk Works. Clarence "Kelly" Johnson was amenable for abounding of the design's avant-garde concepts. During assay missions the SR-71 operated at aerial speeds and altitudes to acquiesce it to outrace threats. If a surface-to-air missile barrage was detected, the accepted ambiguous activity was artlessly to advance and outrun the missile.
The SR-71 served with the U.S. Air Force from 1964 to 1998. Although twelve of the 32 aircraft congenital were destroyed in accidents, none were absent to adversary action. The SR-71 was unofficially alleged the Blackbird, and alleged the Habu by its crews, apropos to an Okinawan breed of pit viper. Since 1976, it has captivated the apple almanac for the fastest air-breathing manned aircraft, a almanac ahead captivated by the YF-12.