I think the usefulness of that observation is limited. If we kill 100 Taliban in one day, our adversaries don't lose much sleep. If we lose 5 Soldiers in one day, it imperils public support for the war. Hence the body armor.
Also, the Taliban can afford to travel light because he can hide among the people. If he runs out of ammo, he can throw down his weapon and mingle with the locals. If a Soldier runs out of ammo, then he's probably getting his head chopped off.
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