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Relatively short lifetimes of base research systems (Mach, Fluke).
Lack of "pickup" by vendors from research prototypes and published papers.
Coincided with NSC interest.
Linux due to growing success and open development environment.
Allowed transfer to a wider community and demonstration of the viability of the security architecture in a mainstream OS.
Reference implementation from which others could learn and apply same ideas to other OSes, not limited to Linux in impact.