Military and civilian police officers with the Marine Corps Air Station Miramar Provost Marshal’s Office, force an acting suspect on the ground during an active shooter exercise at the Navy Marine Reserve Center aboard MCAS Miramar, Calif., April 2. The exercise tested the officers’ readiness in the event of a real emergency. - Military and civilian police officers with the Marine Corps Air Station Miramar Provost Marshal’s Office, force an acting suspect on the ground during an active shooter exercise at the Navy Marine Reserve Center aboard MCAS Miramar, Calif., April 2. The exercise tested the officers’ readiness in the event of a real emergency.