Sounds like they wanted a confrontation!! I just keep buying ammunition!
Well, most of us have enough ammunition...
If a rock/brick got hurled at me or any attack upon myself by someone of a group like this would be met by something that they would never, ever be that sorry again for instigating my justifiable defensive action...
If that is what they are trying to instigate, then D.C. is the worst place to do so, because every single resident of D.C. is relatively dissarmed and unable to defend themselves anyway...
If they did this anywhere else...There might be fewer of them continuing to do this against our military...Or the public for that matter...