In the aftermath of the Civil War (1861-1865), US law prohibited the use of the US military inside the United States for the maintenance law and order. Since 2008 that is no longer the case.
LA Police Department Conducts Joint Exercises with the Military
Dan Bacher, AlterNet: “The LA Police Department … and the U.S. military conducted joint ‘tactical exercises’ in downtown LA this week. One Black Hawk … and four OH-6 choppers … flew over the city during the exercise…. Joint military exercises have also been conducted over Boston, Massachusetts and Little Rock, Arkansas over the past six months…. The exercises become even more ominous when you consider that … Obama signed the National Defense Authorization Act (NDAA) … allowing indefinite detention to be codified into law.”