Clancy is on record saying that his book was basically ignored and prevented a logical continuation of the series. Of course, so did Clear and Present Danger. It should be noted that Clancy was not featured on the poster for the movie.
If I recall correctly he sold the rights to his movies as a bundle ... several at one time. I don't know which is the last of the movies previously sold, but I think he will have more editorial input into them in the future. I heard that he was not happy with the last 2 films.
This also gives me a chance to recall that Fred Thompson played the ADM in Hunt for Red October. I am taking every chance I can get to mention Fred Thompson. Did I mention Fred Thompson should come back out of political retirement and run for prez in '08. I'm hoping he is just waiting for the other jokers to make the buffoons of themselves that I expect they will - and he can step in somewhat late and restore order from the coming chaos.
Fred Thompson. (Sorry, had to get one more out...)
I think that we'd all love to see Thomsen enter the race, but he has stated categorically that he is not running. Time to move on.