Under these specifications, Cahil's disorder can be more accurately assessed.
Cahil experienced intense distress in his personal life as a result of his previous traumatic involvement. This symptom of intrusion is evident by his actions throughout the movie. He is startled by any abrupt movement including dog's barking, his children laughing and is extremely agitated at possibility of his wife and brother having sexual relations behind his back. The irrational emotions and thoughts he produces make it difficult for the soldier to live a seemingly normal life. Escaping internal reminders of his captivity is an uphill battle for Cahil. He consistently displayed symptoms of avoidance in attempt to rid any recollection of his horrible experience from his mind. Cahil"s avoidance to reach out for help compounded his emotions internally. Failing to address his problems cause Cahil's negative emotions to build resulting in irrational emotional episodes and negative alterations in his mood and cognition's. As a result of his PTSD he was unable to experience positive emotions, which let to lack of interest and or involvement in significant events such as his daughters birthday party and blamed him for killing his partner in order to return to his family. Symptoms of arousal and reactivity that Cahil experienced were evident in his self-destructive behavior; thoughts of committing suicide, unwarranted aggression; destruction of property, and the excessive inability to fall asleep.
Unlike most psychological disorders that are predominantly genetic and uncommon, Post Traumatic Stress Disorder is not uncommon and results from exposure to a traumatic event. PTSD is most common in military personnel, especially those engaged in Operation Iraqi Freedom. According to the Department of Veteran Affairs, personnel deployed to Iraq and Afghanistan has a 13.8% PTSD prevalence rate, the highest of all deployments.