After getting my BS in Physics back in the late 80s, my first job was with the Skunk Works in Burbank, CA. The SR-71 was still active in the USAF inventory at that time, although it was about to be retired. I remember seeing a few of the start carts on some of my visits to Palmdale. However, this was before I owned my GranSport, and before I was aware of what a nailhead really was. The story, though, of how the team was able to acquire the engines without telling anybody what they would be used for, and who was actually buying them, was pretty fascinating.
Keith