'I understand we are under Martial Law as of last night' (?)

http://www.youtube.com/watch?v=_oxIsniQ9V4&feature=related

Why is the Army deploying a unit at home starting October 1st for twelve months to assist with homeland security???

From the Army's own website:
http://www.armytimes.com/news/2008/09/army_homeland_090708w/