STAFF Sergeant (SSGT) Dawne Roby, USAF, 305th Security Forces, McGuire Air Force Base maintains an alert posture in anticipation of an attack by Opposing Forces (OPFOR). SSGT Roby is defending her position during a MOBILITY EXERCISE (MOBEX). The MOBEX designed to test the ability of the Security Forces to establish and defend an Entry Control Point (ECP) on an air base. The evaluators of the exercise inserted various stresses against the unit, from probing patrols to frontal assault of the ECP. SSGT Roby and her team members successfully accomplished their mission by repelling all of the OPFOR