Background: Military members (MMs), including Canadian Armed Forces (CAF) Service members (SMs), and Veterans are at elevated risk of experiencing occupational traumas which can cause operational stress injuries (OSIs) including post-traumatic stress disorder (PTSD), and moral injury (MI). Traditional evidence-based psychotherapeutic interventions can be effective in reducing symptoms of PTSD. Some MMs and Veterans, however, are less responsive to these treatments and considered to have Treatment-Resistant PTSD (TR-PTSD).