[XBob]

120 - "Rocketdyne and the other Sub's would simply go to their favorite vendors to build parts to the SCD."

Rocketdyne is one of the very few major contractors/subcontractors which even sort of intact, and I think it is now a part of Boeing. But there were thousands of other vendors and suppliers, most of which don't exist any more, nor do their technologies, techniques, and expertice.

[RightWhale]

there were thousands of other vendors and suppliers, most of which don't exist any more, nor do their technologies, techniques, and expertice

They are still there, just not visible. When sprinkled with government money, they become visible again. Watch.