5-70. Leaders must understand the unique operational and mission variables associated with this complex OE and be able to rapidly transition—from conventional wartime terrain to the constraints inherent to the homeland—to contribute to prevention, protection, mitigation, response, and initial recovery from an assortment of threats and hazards. Commanders must operationally adapt to the characteristic blend of legal and policy challenges that have a distinctive effect on their freedom of action while operating in the homeland. In particular, leaders need to have a good understanding of the Posse Comitatus, information collection activities, and the standing rules for the use of force. The integration of Army capabilities into the guidance and parameters set forth by national policy requires the innovative integration of command and control and other warfighting functions to achieve a unity of effort. Commanders must be able to integrate and synchronize protection efforts with the lead federal agency or other governmental agencies. This results in protecting Soldiers in various duty statuses and civilian personnel from hostile actions while conducting defense support of civil authority tasks. The requirement to deploy into a constrained OE and operate with joint and interagency elements requires a unity of command and flexible Soldiers who are able to improvise and adapt systems originally intended for combat into robust, civilian disaster response systems that are based on the National Incident Management System.