Short answer: the type of groupthink that encourages a 'shoot first, ask questions later' type of attitude. That emphasizessnap judgments. Is this kind of culture necessary in environments such as Iraq? Maybe. I lean towards 'yes;' I don't think there's any other realistic choice, and a shift in group mindset would probably bring more harm than good in the way of casualties. But that doesn't mean it doesn't have downsides, which should be seriously weighed and considered.