This morning, DCist heard more complaints from District residents about yet another loud racket which woke them up a little earlier than they would have preferred. Fortunately, though, we didn’t have to go on quite the same kind of wild goose chase to figure out what happened this time — Arlington’s alert system filled us in that, indeed, the booming noises were again blank cannon blasts, fired during a drill conducted by the Old Guard’s Presidential Salute Battery.

Victory is ours! DCist has finally hammered down precisely what was creating noises that sounded like pile driving around the District early this morning: a World War II Anti-Tank Gun. Yes, you read that correctly.