That's why they are "unlimited." Because they are an imaginary foe.
Osama Bin Laden died of kidney failure in a U.S. Naval Hospital in the summer of 2001, months before the attack on the World Trade Center. The videos that have been released since are generic rants by Bin Laden recorded years ago with crappy propaganda translations to make them seem current. They're about as genuine as Adam Pearlman, the American arm of "Al Qaida," and various other Mossad ops.
You probably won't believe this, but sometimes I really think everything is for the best in this best of all possible worlds.
If the average American is really stupid enough to fall for all this crap, maybe they deserve the leaders they have. Maybe they deserve everything that has happened and will happen to them. It's hard to feel sorry for somebody who supports bombing civilians without even knowing where their country is located on the map of the world. They have no virtues as a people with which to commend them. That's the most damning thing I can think of to say about them.
I honestly believe that God has abandoned America to hell and unleashed all the entropic forces of the universe on that poor nation in order to destroy it forever. I also believe that America abandoned God first, before he abandoned them.
As Mel Gibson pointed out in "Signs," the movie by M. Night Shymalayan, there are two types of people in the world. America embraced secular atheism. They believe nobody is coming to help them, the world is the product of randomness, there is no God. Now they shall discover what it means to live in just such a universe. It's a very, very bad place.