Background: As provisions of mental healthcare services to military and veteran populations increases the risk to service providers developing secondary traumatic stress (STS), efforts areneeded to examine the impact of delivering novel interventions which may include 3MDR. As avirtual-reality supported intervention, 3MDR exposes the patient, therapist and operator tographic and sensory stimuli (i.e. narratives, imagery, smells, and music) in the course of the intervention.