Are the troops defending our country or just bringing freedom to iraq?

I don't see how the troops are defending our country from a poor country who can't really invade us. I mean people are always going to say 9/11 but most say that was a conspiracy. Im not saying it was im saying if they were to invade us we would wipe them out before they even touch the soil so are the troops defending this country or bringing freedom to iraq. I noticed the mission has changed overtime.Weapons of m destruction(they're a poor country how could they have that and even if they did why not use them), Saddam(ok we executed him...but didnt he have knowledge to the weapons of m? or did we execute him and not ask?), Now finding osama...(idk if osamas even real and if he is hes probaly dead.What are your thoughts about the war?