I like Dale Brown as well. Very good writer, and technically accurate as well - not quite at the level Clancy was, but close enough to make his books really good reads.
My dad loved Hunt for Red October - he was a missile tech on ballistic missile subs in the 60's & 70's; he was around for the first missile systems (Polaris) to be put into subs in the 60's. A few years ago I read a non-fiction book by John Piña Craven, called The Silent War. Craven had been one of the scientists who helped engineer those first submarine missile systems.
My dad was stunned, almost speechless, when I told him some of what was in Silent War. Basically, he told me that he and the guys he served with were told they would never be able to tell anyone in their lifetimes what they had done in the Navy, under threat of incarceration. But he did know from what Clancy wrote, that a lot of very technical, supposedly "secret" info was available if anyone just wanted to look for it.
~Chris