Roughly 1.8% of Canadians and 10% of Americans are veterans. Many veterans go on to live meaningful and highly productive and successful lives with families and careers. However, the nature of combat can cause Post Traumatic Stress Disorder (PTSD). It's estimated that up to 30% of combat veterans have PTSD in their lifetime. That's around 200,000 Canadian veterans and 6.12 million American veterans. Among combat veterans with PTSD, 30% to 40% report auditory or visual hallucinations and/or delusions, as stated in the book "Military Medicine" (pp. 273–277). The presence of psychotic symptoms in PTSD can be extreme and is similar to that of chronic schizophrenia.