Chapter I - Overview: (2) Domestic, Foreign and Military Situations: (A) Joint forces may respond to CBRN incidents under several different situations characterized as domestic, foreign, and military. Both the geographic location and the political or diplomatic context factor into the selection of USG lead for a CBRN incident response. (1) Domestic: The geographic scope of the domestic CBRN response is associated with the US homeland. The homeland is the physical region that includes the continental United States (CONUS), Alaska, Hawaii, US territories, and surrounding territorial waters and airspace. For most domestic CBRN incidents, when requested by the affected state, DHS coordinates the federal government's incident management efforts to include the resources utilized in responding to or recovering from terrorist attacks, major disasters, or other emergencies. Generally, when tasked, DOD is a supporting agency, coordinating agency, or cooperating agency in support of DHS within the NRF and National Incident Management System (NIMS). The complex and unique aspects of domestic CBRN CM are detailed in Chapter II, Domestic Chemical, Biological, Radiological, and Nuclear Consequence Management. (2) Foreign: A response could take place in a permissive or uncertain foreign operational environment. Requests for FCM originate from an affected nation through DOS. Chapter III, Foreign Consequence Management, outlines the specific details of DOD CBRN response under FCM. (3) DOD-Led: The military situation is when CBRN incidents occur requiring DOD to lead the USG response effort due to the lack of DOS and/or sufficient affected nation federal presence as a result of military operations or for a CBRN incident on a DOD installation. On-scene commanders may take appropriate action in responding to life threatening situations while awaiting DOD/DOS tasking (See information on immediate response in subsequent chapters). More information on CBRN CM and how the DOD CBRN response effort associates with the USG effort is provided in Chapter IV, Department of Defense-Led Chemical, Biological, Radiological, and Nuclear Consequence Management. (B) DOD has an associated preparation and CBRN response framework for specific employment of military forces in the USG effort in each of the three designated situations