(I) Combat stress may arise when an event, situation or condition in a fighting zone requires a soldier to alter his or her behaviour in response to new demand. (II) As a result, certain situations could have placed so much strain on an individual that he or she could not maintain a normal level of functioning. (III) This change in behaviour typically presents cognitive, physiological and emotional challenges. (IV) Such stress is a normal and expected experience for deployed personnel, and the vast majority of soldiers manage it effectively. (V) Many actually perform better under reasonable levels of stress.