All, Trooper 2 in chatting with Andrews approach (119.3) advised him that ther were 8-9 helos down there now (2125 EDT) and that they would probably be active all night. Wash Helo control is on 120.75 and Wash App/Dep on 126.55 is also reflecting some of the flighst as they transit the Class B airspace. RON ANNE ARUNDEL COUNTY, MD (NEAR BWI)