JP 3-28, page 159

Glossary GL-7 defense coordinating officer. Department of Defense single point of contact for domestic emergencies who is assigned to a joint field office to process requirements for military support; forward mission assignments through proper channels to the appropriate military organizations; and assign military liaisons, as appropriate, to activated emergency support functions. Also called DCO. (Approved for incorporation into the DOD Dictionary.) emergency preparedness. Measures taken in advance of an emergency to reduce the loss of life and property and to protect a nation’s institutions from all types of hazards through a comprehensive emergency management program of preparedness, mitigation, response, and recovery. Also called EP. (DOD Dictionary. Source: JP 3-28) emergency preparedness liaison officer. A senior reserve officer who represents their Service at the appropriate joint field office conducting planning and coordination responsibilities in support of civil authorities. Also called EPLO. (DOD Dictionary. Source: JP 3-28) emergency support functions. Government and certain private-sector capabilities grouped into an organizational structure to provide the support, resources, program implementation, and services that are most likely to be needed to save lives, protect property and the environment, restore essential services and critical infrastructure, and help victims and communities return to normal, when feasible, following domestic incidents. Also called ESFs. (Approved for incorporation into the DOD Dictionary.) federal military forces. Army, Navy, Marine Corps, and Air Force personnel (including Reserve Component personnel) on federal active duty. (Approved for inclusion in the DOD Dictionary.) homeland. The physical region that includes the continental United States, Alaska, Hawaii, United States territories, and surrounding territorial waters and airspace. (DOD Dictionary. Source: JP 3-28) hostile act. An attack or other use of force against the United States, United States forces, or other designated persons or property to preclude or impede the mission and/or duties of United States forces, including the recovery of United States personnel or vital United States Government property. (DOD Dictionary. Source: JP 3-28) immediate response. Any form of immediate action taken in the United States and territories to save lives, prevent human suffering, or mitigate great property damage in response to a request for assistance from a civil authority, under imminently serious conditions when time does not permit approval from a higher authority. (DOD Dictionary. Source: JP 3-28) incident. An occurrence, caused by either human action or natural phenomena, that requires action to prevent or minimize loss of life or damage to, loss of, or other risks to property, information, and/or natural resources. (Approved for incorporation into the DOD Dictionary.)