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The fight-or-flight response is a physiological reaction to a frightening event or encounter. Fear triggers the desire for self-preservation. Although in some cases flight may be the best option, in war, aggressive, self-confident fighters are critical to success. To prepare the body either for confrontation and defensive fighting or for fleeing, the brain diverts blood to parts of the body that most need additional energy. Both the violence and complexity of war place soldiers in frequent, sometimes uninterrupted, situations of uncertainty and fear. Training is necessary for soldiers to overcome the likelihood of running rather than fighting. Remaining in an intensely fearful state for a long time produces extreme stress that can inhibit the immune system, leaving the body more easily vulnerable to illness. ...

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