While watching the news yesterday they showed a scene of US soldiers on patrol inside a city, and as they were passing buildings there would be someone on the roof waving a stick with a rag tied to the end to let others know where the soldiers were. The soldiers with the tv news crew along with them just continued on down the street. People are marking you position for a possible ambush or sniper attack, but you don't respond. Perhaps because you know that if you do respond you will find that someone told a kid to stand on the roof and do this because they knew the soldiers wouldn't attack unarmed children.
It's not easy for the US to win this kind of war. If Saddam was running things, he could. But then the tactics he would use to win would be labeled as barbaric, but nevertheless they would be very effective at eliminating foreign insurgents and pacifying the population in Iraq.