22 percent of all combat injuries U.S. Department of Veterans Affairs webpage on PTSD. traumatic brain injury brain injury increases your chances of also having PTSD 22 per cent of all military injuries brain injury increases your chances of also having PTSD National Center for PTSD 22% of combat casualties traumatic brain injury Learn More about PTSD & Traumatic Brain Injury 22 percent of all combat casualties in Iraq and Afghanistan traumatic brain injury 22 per cent of all military injuries co-occurring estimated 22 percent of all combat casualties in Iraq and Afghanistan 22 per cent of all military injuries 22 percent of all combat casualties in Iraq and Afghanistan brain injury increases your chances of also having PTSD according U.S. Department of Veterans Affairs webpage on PTSD. 22 per cent of all military injuries 22 percent of all combat casualties in Iraq and Afghanistan brain injury increases your chances of also having PTSD U.S. Department of Veterans Affairs webpage on PTSD. co-occurring