The story of the ultrasecret A-12 Oxcart--father of the SR-71 Blackbird

It may look like the SR-71 Blackbird, but this sleek flying beast chained to the ground at the CIA's headquarters in Langley, Virginia, is not the most famous supersonic spy plane ever created but its father, the A-12 Oxcart. In some ways, it was a better machine than the famous Blackbird.