The Afghans gave the British army hell when the latter was the best in the world. They held out against the Russians for seven years even though the Russians were operating on far fewer restrictions than the U.S. in Vietam. So, it is true that we should think a lot before starting a ground war. Likewise, a few rockets or air strikes are token efforts. However, sustained air strikes against MILITARY targets in conjunction with hit-and-run raids by Airborne troops might get the point across.