A member of the Mobile Reserve security force calls out a "halt" towards OPFOR (Opposition Forces) members along a perimeter breech during Exercise BEVERLY BULLDOG, a combination of an Initial Response Readiness Exercise (IRRE) and a Combat Employment Readiness Exercise (CERE). The Mobile Reserve is a unit tapped to provide extra security after or during an attack. They are taking part in Kunsan's July base wide exercise to keep a sense of readiness in the ongoing peacekeeping mission on the Korean peninsula