Just after 1730 hours, Engine Co.37 was dispatched for the departmental accident with entrapment involving county police. The initial call location was the ramp to Ritchie Marlboro Road which was later updated to the inner loop of the beltway prior to Ritchie Marlboro Road. Engine Co.37 arrived first, confirming that the officer was trapped and began assessing other injuries & vehicles involved. Engine Co.37 provided medical care to the officer while stretching a hand line in preparation for the squad to handle the extrication. Squad Co.6 arrived completed the extrication and the patient was removed in under 3 minutes for transport to PG trauma center.