1. There is the VRE Station that is on Brooke Road and that will take you down to DC/Union Station
2. Aquia Harbour, as a community, for example, has their own direct shuttle buses to the major points in DC, including the Pentagon
3. The slug line at the 610 lot is phenomenal also. If you have never slugged, most of the time, you can check with the drivers to see their destination hours. You do have to arrive early in order to catch the best available option.