This is a GREAT book about the SR-71. I'm submitting since there are so many posts on this topic recently. It's unfortunately out of print, but I'd encourage anyone who enjoyed the recent posts on the SR-71 to look for this in the local library ( I know who does that anymore! ).
I someone could find a story about a TSA agent hassling a SR-71 crew about Bitcoins, it would never leave the front page.