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combat fatigue, a neurotic disorder caused by the stress involved in war. This anxiety-related disorder is characterized by (1) hypersensitivity to stimuli such as noises, movements, and light accompanied by overactive responses that include involuntary defensive jerking or jumping (startle reactions), (2) easy irritability progressing even to acts of violence, and (3) sleep disturbances including battle dreams, nightmares, and inability to fall asleep. Although persons in combat differ widely in their susceptibility to combat fatigue,...