At 0238 hrs units were alerted for a MVA on the Capital Beltway at Darcy road. Bureau chief 7 arrived to find SUV that had rolled over with Engine 373 arriving shortly after. The found that they had two patients trapped and one ejected. Due to the injuries a helicopter was asked for bring Trooper 2. Squad 8 arrived and started extrication while the crew from 373 started patient care and pulled an attack line. One of the trapped patients and the one ejected were transported to a local trauma center by the trooper while a third patient was transport by ground. Units cleared in a little over an hour.