The National Disaster Medical System (NDMS) is a federally coordinated healthcare system and partnership of the United States Departments of Health and Human Services (HHS), Homeland Security (DHS), Defense (DOD), and Veterans Affairs (VA). The purpose of the NDMS is to support State, local, Tribal and Territorial authorities following disasters and emergencies by supplementing health and medical systems and response capabilities. NDMS would also support the military and the Department of Veterans Affairs health care systems in caring for combat casualties, should requirements exceed their capacity.