He was identified as having post traumatic stress disorder when he returned from service in Iraq.

VOA: special.2009.12.11

He notes that many veterans suffer from post traumatic stress disorder.

VOA: special.2010.12.28

Studies suggest nearly a third of war correspondents suffer from Post Traumatic Stress Disorder (PTSD).

VOA: standard.2010.07.01

That he restored my soul." After the documentary's premiere in Washington, Bill Campbell's wife,Domenica, said that Pax helps her husband in multiple ways - including when Sgt.Campbell struggles with the hyper-vigilance that is one of the symptoms of post-traumatic stress disorder.

VOA: standard.2010.05.18