I found the audio file for getting promoted to admiral. After lauding you quite a bit, you are told to go read a book. Don't remember the quote though. Too apathetic to dig the files up again. 
The FreeSpace 1 ones are much funnier. They repeatedly accuse you of cheating. 
LOL
Quotes would be much appreciated.
Dang, you're still an ensign! You must've gotten busted.
We aren't sure how you've done, but you are hereby promoted to the rank of Rear Admiral. We think you cheated.
You must've really cheated to get this rank. Do you want to sit behind a desk all day? This is what Vice Admirals do.
You really have got to stop cheating. This could become a natural thing for you, and that would be bad. Go on Admiral Cheater, I think you have to perform some inspection or ceremony or something.