I think this is a combination of stories. First, there was some overuse of power by Blackwater in New Orleans during Katrina. Second, there is a brigade coming home from Iraq being retrained for homeland missions. These missions involve helping during natural disasters, possible terrorist attacks, crowd control, etc. I take this to mean doing a similar job as the national guard. While this brigade will have been in combat, I don't expect them to go out and use the same tactics here.
A small article about it from the Army Times:
http://www.armytimes.com/news/2008/0...eland_090708w/