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During missions abroad, personnel experience situations that involve constant physiological stress (poor diet, few opportunities for good personal hygiene, etc.), but also psychological stress (worry about improvised explosive devices, snipers or the death of comrades), such a condition causes a constant state of hyperarousal that is functional and adaptive to the context for survival, enabling them to identify a threat and act accordingly (fight or flight). But, there is a thin line separating a normal reaction to stress from a real trauma-related disorder, i.e. Post-Traumatic Stress Disorder.