Marine and Family Programs provided military service members with a Combat Operational Stress resource and information booth at the entrance to Pendleton's Marine Corps Exchange, June 15, in effort to shed light on Combat Operational Stress. Some indicators of COS are disassociation, mood swings and even emotional, verbal or physical outburst. - Marine and Family Programs provided military service members with a Combat Operational Stress resource and information booth at the entrance to Pendleton's Marine Corps Exchange, June 15, in effort to shed light on Combat Operational Stress. Some indicators of COS are disassociation, mood swings and even emotional, verbal or physical outburst.