There is no distinguishing way of knowing who the enemy is when in Iraq. Most of the time when you get hit with an IED you never see who or where the enemy is. When you do get engaged it is normally by a sniper, so you dont see the enemy in that case either. The insurgency in Iraq very rarely engage in open battle with us. When they do it is normally during a complex ambush which is where we would be riding down the road on patrol and we would get hit with an IED, the firefight that follows is always very intense and very breif. They attack then they flee. I hope this doesn't worry you too much because all of these instances are rare, we are more likely to die of boredom than combat. Normally we would go for weeks or months without any type of enemy contact, then when we would be least expecting it the most is when it happens. This is what we are trained for, and we are the best at what we do. Believe me the insurgents have more to fear from your son, than he ever does from them.