What he did was wrong and I don't believe you can use PTSD as an excuse but I also have to agree with Sky-guy. While I was in Afghanistan we had a greater number of civilians (locals) killed/injured by the Taliban (insurgents) than the number of Taliban (insurgents) we killed/injured/captured. Now that was only in the 4 COPs I worked out of so a pretty small area (which actually happends to be about 5KM from were this took place) but I would think it would hold mostly true for most of the country.
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"A bad day fishing, is always better than a good day of yard work"