The toll can result in a wound for some, officially known as post-traumatic stress disorder (PTSD), which manifests, impacts and plays-out in the physical and mental health of not only veteran personnel, but also as secondary trauma among their family members.
Research showed those suffering from PTSD had sustained a brain injury, he said.
"While the RSA recognises there is a broader mental health picture to also consider, we have made a decision to focus on combat trauma and PTSI advocacy. Trauma can physically change the brain's processing pathways, a person cannot help this, so the RSA wants to change the incorrect perceptions and stigmatisation associated with PTSD by referring to it as a wound, and using the term Post Traumatic Stress Injury - PTSI.
"This much more properly describes what the service person has sustained and gives long overdue validation to their wounding and suffering, including the long term impacts on their families."
Compain said until recently the RSA had done little nationally to proactively identify their concerns and raise awareness about the realities of modern service.
He said some service people were suffering in isolation from traditional support networks such as family and friends, and would float under the radar.
"Despite the best of intentions, the RSA has not yet cracked the problem of being the safe, trusted 'go to' organisation of choice for them, and to be able to understand and offer relevant support in timely ways," he said.