I, and people very close to me were there that week, were you? I wasn't on during the day of the marathon, but I think I would have been aware of a training exercise, or a directive to tell people there was a training exercise going on. Whenever you have dogs working, there are the inevitable questions of "what's going on" and in the absence of a credible threat, the answer is "we're just running them through training exercises" because, in all reality, that's what it usually turns out to be. That statement and Urban Shield are two VERY different things, and you're saying they are the same.
You are trying to excuse the actions of someone that attempted to kill my partner in the back of an ambulance and say that their actions were done by the government under false pretenses to cause some effect that the government wanted. I know we'll never agree, so I'm going to drop this right here.