Armstrong always has been a bit cryptic in his speeches, take a look at this one;

http://uk.youtube.com/watch?v=PUx1SURbb3g&NR=1

But yeah, it does or might seem like he's hiding something or was brainwashed or whatever. Interesting stuff, even though it could be just a case of not being very good at explaining without mentioning specifics? Perhaps they were ordered not to reveal any specific events, as there are rumors that the mission wasn't exactly easy (many problems along the way)..

I don't know, compare it to someone coming home from a military tour, they will undoubtedly be glad to be home and happy, but once they realize what they did or experienced they might not be all that happy. I'm not saying they fought or anything, only that they may have been struggling to survive at some point or something along that way.