Hurricane Katrina
Wikinews recently published an article which explained that NorthComm, through an Executive Order of the President of the United States, directed the 3rd Infantry Division's 1st Brigade Combat Team to return to the United States from active duty missions in Iraq to begin training in a new role. NorthComm says that these troops will be used to protect the United States from threats within the United States, as well as to provide a support role to local and state agencies during times of emergency, such as with 
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US Army sergeant asserts Posse Comitatus is not being violated