title: What potential for helicopters in EMS.
mesh_terms: D000401:Aircraft; D000552:Ambulances; D003365:Costs and Cost Analysis; D004632:Emergency Medical Services; D006285:Health Planning; D006801:Humans; D008887:Military Medicine; D012423:Rural Health; D014187:Transportation of Patients; D014481:United States; D014505:Urban Population; D014744:Vietnam