[Rider on the Rain]

The Blackbird is an SR-71, not SR-72.

[VRWCmember]

You are correct; the Blackbird was the SR71, a plane with a very interesting history.

And, as it turns out, the SR-72 will be a hypersonic unmanned aerial vehicle in another 15 years or so.

http://www.lockheedmartin.com/us/news/features/2013/sr-72.html