This video appears to be just someone’s lack of knowledge, or ignorance and wild imagination, driving them to create such a video and conspiracy. The truth will set you free - and fortunately - there is another side to this story which completely debunks the Blackwater-Craft theory.
The Real Story
The military looking guys in the video/photos are actually Massachusetts Guard’s 1st Weapons of Mass Destruction Civil Support Team (WMD CST). You may be asking yourself, what were they doing there? Good question.
Since the Boston Marathon is so huge, the National Guard plays a significant role, and at the Boston Marathon there were several hundred national guardsman on duty that day, including small factions of the WMD CST. When the bombing happened, of course they were there to spring into action and help. There job isn’t to be first responders, their jobs are to find out what’s going on, and see if there is additional threats. That is what they were doing there. There is actually WMD CST teams all over the U.S. for each state.
This story is a cross-post from BitShare.