We are vulnerable on so many fronts. I myself travel to and from work via either the appallingly congested I-95 corridor between D.C. and Fredericksburg, Virginia OR via the Virginia Railway Express (VRE) one of the least comfortable train services I've encountered! One of the stops is Quantico!
And in between those rather unattractive choices there is always the Washington, D.C. Metro system! Holy crap! as Frank Barone (Everybody Loves Raymond) would say!