The TCSEC and Common Criteria are really being developed by various Defense agencies; in the US, NIST is also involved, as I suppose DIN, BSI, AFNOR, etc. are. NSA is uninterested in making systems secure; their job is to break them anyway. Since the TCSEC doesn't specify mechanism, it's at too abstract a level for NSA to tamper with.
There are no boogie men from the Spy House involved here, at least in the US. You can sleep well again.
I wouldnt exactly say that (although I doubt the NSA's involvement here is shady). The NCSC which came out with the original Trusted Criterion (rainbow books including the orange book) is stationed at Fort Meade MD. (oddly enough right by NSA). If you get information sent to you from the NCSC sometimes the return address will say NSA on it instead of NCSC. If you read through the schedule of any of the conferences they put on you will see a good percentage of people with NSA next to their names. The NSA *does* have alot of interests in trusted systems and making systems secure. They are the national *Security* Agency. While half of the people at the NSA are working on how to break other peoples security there is still a good fraction of them learning how to make their own systems safe.
Jason Zions