I've read a ton of Clancy's books, Rainbow 6, Red Storm Rising, Hunt for Red October, Patriot Games, Clear and Present Danger, Dept of Honour, Politika (co-written by him), and various Op-Center and Net Force novels, none which were written by Clancy, but they are in the world Clancy developed.
Red Storm Rising was the last book of his I read, and it will remain as the last book of his I'll read. After reading so many of his books, the all blend into the same old things, with different twists. But just having different twists to separate his stories is not enough for me. You can break down most of his books into a simple formula of clear cut good vs. evil, evil guys attack, good guys are surprised and plan counter attack, which is somewhat effective but the evil guys big plan still goes down but good guys get the jump on them and prevent disaster. Or something like that. I take real issue with the happenings of WW3 in Red Storm Rising. There were many many attacks by both the "good guys" and the "bad guys" and it was like watching a "pong" game on the atari, good guys attack is successful, bad guys is, good guys is, good guys is, bad guys is, bad guys is, good guys its game over... Actually I think a boxing match would be a better analogy, where each round was a chapter, and you could score it for the good guys or bad guys.
Anyway I didn't like that book. The first book I read was Politika, and I loved it, because it was more espionage than shoot-em up like Rainbow Six was, but Rainbow Six was good in my opinion as well.
Like someone said, they are fiction, I have no idea about the accuracy of his writtings. Some of his books are good, some are bad, but all of them follow the same formula if you ask me.