Virtual Iraq is a Virtual Reality exposure therapy system co-written by Albert 'Skip' Rizzo and Jarrell Pair as a tool for Prolonged Exposure Therapy (PET) or Immersion Therapy- a form of cognitive Behavioural Therapy (CBT). PET is an accepted treatment for Post Traumatic Stress Disorder (PTSD), in which the patient is gradually exposed to the feared situation, object, thought or memory through conversation through a process of habituation.