But fighting the U.S. Army will get you labeled as a terrorist now, will it not? The U.S. Army has to go sticking its nose in everyone's business, and opposition to that means you're a terrorist apparently.
Not necessarily. The US Government/Army may have it's problems, but neither are inherently corrupt to the point where a revolution is needed (yet). Also, like I said, terrorists target civilians. Attacking civilians is not the way to overthrow a government.
The difference is motivation as well as means.