Why is it important for our Government to conceal the fact that "9/11 Like" Wargames were going on at the time of 9/11?

I've thought about this A LOT, and I think it could be one of three things:

1) The Wargames were an intricate part in the success of 9/11.
2) The Wargames showed that there actually were people in Government who could have "imagined" something like 9/11 taking place (proving that Condoleeza Rice committed perjury).
3) The Wargames weren't important enough to mention in the 9/11 Report, hence the reason it only merited a "footnote".

Now, the third one is not the case, and I'll tell you why. General Eberhardt said that the Excercises that were taking place, enhanced our ability to respond. Obviously that is not the case because all four planes were successful. Also, the question from the Commission in and of itself, shows that the Wargames were important enough to mention.

So... which is it? Number one, or number two?