The United States National Response Framework (NRF) is part of the National Strategy for Homeland Security that presents the guiding principles enabling all levels of domestic response partners to prepare for and provide a unified national response to disasters and emergencies. Building on the existing National Incident Management System (NIMS) as well as Incident Command System (ICS) standardization, the NRF's coordinating structures are always in effect for implementation at any level and at any time for local, state, and national emergency or disaster response.