As a combat veteran, you have lived through events that most people can't understand. You and your friends were in danger. Life in the war zone was very different from life at home. Your daily routine could be interrupted by intensely stressful and chaotic events. In fact, you've likely been in or seen life-threatening situations. And you had to hide your feelings and reactions to stress. Now you're home. Even though you're safe, something's not right. You're having nightmares. Or unwanted memories of combat are popping into your head unexpectedly, sometimes set off by a sound or smell. You may feel anxious, angry, scared, guilty, or isolated. And the feelings won't go away. These are signs of posttraumatic stress disorder (PTSD).