At around 11 this morning, what looked like two military helicopters flew so low over my building that the windows shook (hell, it seemed like the whole place shook). They seemed like they were headed north. I’m not at all familiar with military aircraft but they looked kind of like this Blackhawk, but black. They were definitely not news choppers or anything commercial or civilian – they were obviously military. I just don’t know what model, and since I saw them from their underbellies I thought I’d try and identify them by in-flight photos. Anyone else see them or know what might have been going on?