Corporal Gilson was deployed to Afghanistan with the Intelligence Surveillance Target Acquisition and Reconnaissance Squadron, 1st Battalion, The Royal Canadian Regiment Battle Group. On October 3, 2006, his observation post, located in the Pashmul region, was attacked with small arms fire, rocket-propelled grenades and rockets. In the face of this devastating attack, Corporal Gilson maintained his composure while calming the wounded. Ignoring his own injuries, he continued to provide radio situation reports and adopted a fire position to repel further attacks. Corporal Gilson’s actions and composure under fire reflect the highest standards of professionalism in combat.