Pretty fascinating thinking about all the former top secret projects that we all know about and love today............were testing in the early 60's!! I've got the fortunate of having a father who's close personal friends with all the test pilots of the mach 3.2 YF-12/A-12(precursors to the SR-71 "Blackbird") as well as early U-2 test pilots and numerous other test program top secret stuff from back then. Imagine what we don't know about what's up there TODAY. Really fascinates the hell out of me.