to be fair...
... Linux security guys first looked at what MULTIX and VMS did. Whether they improved on these models or just mitigated structural issues is open to discussion (most *BSD people, for example, would tell you that the Linux security model sucks moose balls. Most VMS people would probably not even utter the words "Linux" and "security" in the same sentence without washing their mouth with black soap immediately afterwards. But IT is all about making exactly the right amount of compromise. Or so I've been told.).
Good news for the Church of Jobs anyway. With the usual reservation: you can have all the security experts you want, it won't help you the least if their choices are overridden by the marketting dept. (see MS history for proof).