Yup.
And what people also don't realize is that you don't need to prove that the defendant is guilty beyond a reasonable doubt, there is no discovery, there is no jury and there is no appeals process for a military tribunal.
Why on earth would you make things harder on yourself when trying to prosecute the guy who perpatrated the 911 attacks?
Outside of trying to put the Bush admin on trial, I cannot think of a single good reason for Obama to do this-- and even then, its good for liberals and bad for the country.