Lockheed SR-71B Blackbird, flown by the Dryden Flight Research Center as NASA 831, slices across the snow-covered southern Sierra Nevada Mountains of California during a 1994 flight. SR-71B was the trainer version

Lockheed SR-71B Blackbird, flown by the Dryden Flight Research Center as NASA 831, 

slices across the snow-covered southern Sierra Nevada Mountains of California during a 1994 flight. 

SR-71B was the trainer version 

Lockhead SR-71B Close-up of the SR-71B operated by NASA’s Dryden Flight Research Center, Edwards AFB, California

SR-71 refueling from a KC-135Q Stratotanker during a flight in 1983

Lockhead SR-71 at Pima Air & Space Museum, Tucson, Arizona

The SR-71 was the world's fastest and highest-flying operational manned aircraft throughout its career.