Interesting points, but myself don't think that supporting insurgents makes the U.S. an insurgent. The idea of undercutting the legitimacy of the existing power structure fits into my definition--since I stress trying to alter the power balance, that is just one of many methods of trying to weaken the existing power. And since I define it as a strategy, not a form of conflict, of course organizations can shift from insurgency to another strategy just as a nation can shift from one strategy to another. That's the reason that I've never found much use in trying to decide whether an organization is or is not an insurgency.