US military adventurism could be an interesting topic to discuss, mP. Why don't you start a thread about it since you seem to have a lot to say about it?
This thread, however, is about the tragic US Navy Yard shooting nothing of which indicates it had to do with US policies or that any of the victims were combat personnel. So far it seems to have everything to do with the all-too common scenario of a mentally disturbed individual shooting up his workplace. We need to investigate why this person's mental health indicators did not trigger the system to flag his behavior as potentially dangerous, and how he had access to guns.