As a former EW.  I got to spot those planes when no one else could.  in fact...
I had a situation pulling picket duty off the coast of florida where I could not identify the radar. 
Took two years, (out of the service) to find the specs and Identified that bogey as a U2.  I emailed the former shipmate of mine. and got an earful about using unsec lines. 
No comment on the fact that I used OSINT to identify it.
I couldn't believe they are still flying them...
As for the blackbird.  Many people believe it is called the SR-71.  It was actually the RS-71... (reconnaissance strike, not strategic reconnaissance) Nixon gaffed it when he announced it and the name stuck.  Another myth is that it was believed it was developed as a spy plane because it "flew to fast to act as a strike aircraft"  except that is exactly what is was designed to be... Flies too high and too fast to be shot down... drops a couple missiles and goes on its way...
Little bit of a history buff 
