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Background: Military personnel exposed to potentially traumatic events whilst deployed on operational duties may develop psychological problems. The Royal Marines have made extensive use of Trauma Risk Management (TRiM), a peer-support system that operates through practitioners embedded within operational units. TRiM aims to promote recognition of psychological illness and to facilitate social support., Aims: To evaluate the effects of TRiM in two units at different stages of implementation., Methods: Royal Marines and Army personnel were surveyed prior to, during and upon return from an operational deployment to Afghanistan. Participants completed measures of general mental health (GHQ12) and traumatic stress [PCL(C)]., Results: We received responses from 180 pre-deployment, 105 during deployment and 137 post-deployment. Personnel within units with experience of TRiM reported lower levels of psychological distress than personnel in the unit who were using TRiM for the first time. Both groups reported higher psychological distress scores before and during deployment, compared with post-deployment. However, we found personnel who reported having more access to social support during deployment reported less psychological distress., Conclusions: The use of TRiM may assist in increasing the psychological resilience of military personnel through the facilitation of social support; this may have particular utility during operational deployments.